《三棱锥的三面投影》教学设计1

《三棱锥的三面投影》教学1 《三棱锥的三面投影》教学设计 学 校 姓 名 学 科 授课班级 教学内容 三棱锥的三面投影 1(知识与技能 (1)了解棱锥体的几何组成特点 (2)掌握棱锥体三面投影的基本规律 (3)初步学会绘制棱锥体的三面投影图 2(过程与方法 (1)通过变式练习，培养学生的思维能力 教学目标 (2)通过比赛练习，提高学生的动力操作能力 3(情感、态度与价值观 (1)通过小组合作学习，强化学生的合作学习意识，培养学生的团 队精神 (2)通过学生相互评价，培养学生的语言达能力，及学生公平、 公正的评判意识。 教学重点 棱锥体三面投影的基本规律 教学难点 投影点的确定 课 型 新课 1( 教学用具:棱锥体模型 2( 任务学习单 教学准备 3( 多媒体教学课件 4( 教学场地的布置 教学方法 讲解法、任务驱动法 教学流程 教师活动 学生活动 设计意图 be carried out in time rust and antirust paint twice. While skeleton construction curtain wall fireproof, antisepsis, mine should be simultaneously, all skeletons complete after the required time and concealed work inspection, acceptance of concealed work qualified before the stone plaque installed. Stone in stone before they can use pollution prevention performance, radiation energy, water absorption properties and bending strength of various performance testing protective treatment and six stone two times, and minimize chromatic aberration, chromatic aberration under control mainly in the specification sheet and the stone material control, specification order form should try to distinguish between separate parts orders. Stone cutting must be carried out according to the same part of the same batch, different parts of different facades of stone panels applied when cutting different symbols of letters or Arabic numerals differentiates, in order to facilitate timely and accurately identify different stone when installing special mounting parts. Resolutely put an end to abuse with abuse. In addition to control and the local color, the other in the stone wall construction should be carried out before publishing, model wall dimensions as 84000mmx2000mm, stone size options for 1200mmx400mm 1.通过教师引 言，让学生意识教师引言:棱锥体形建筑因其结构简到掌握棱锥体单、外形美观、牢固实用而被许多设的三面投影图听 计者所采用。若干年后也许我们班的 绘制的重要性同学也会设计出类似于下面所展示 和必要性，以提的建筑物。 高学生学习的 内驱力。 教师呈现2——3幅学生较熟悉的有 代表性的棱锥体形建筑物的彩色图看 片。 学生观察后回答以下问题: 情景导入 这些建筑物的外形结构有什么共同 (时间2分钟) 特点, 教师:要设计出类似于上面展示的建思 筑就必须先学会三棱锥的三面投影 图的绘制，从而引出新课题。 2(告之学习目呈现课题 教师呈现课题——《三棱锥的三面投 标，为学生的学及 影》 习做好定向准学习目标 明确学习目标 备。 教师告之本节课的学习目标。 3.技能的形成学一学 教师展示模型，让学生了解三棱锥的 离不开教师的(时间10分钟) 几何组成特点，分析得出三棱锥的几 教学示范，同时 何定义。 观察 也需要相应的 教师利用模型让学生观察三棱锥体 知识做铺垫。 分别在三个不同投影面上的投影图 形。 提出问题:如何根据已知两个投影面 的投影图作出它在第三个投影面的 投影图, 教师边讲画 教师呈现三棱锥的投影特性: 4.掌握方法可教师小结三棱锥投影图的绘制方法: 以极大地提高长对正高平齐宽相等(九字方针) 学习效率。 教师活动 学生活动 设计意图 mmstruction should be carried out before publishing, model wall dimensions as 84000mmx2000mm, stone size options for 1200mmx400parts. Resolutely put an end to abuse with abuse. In addition to control and the local color, the other in the stone wall con untingbic numerals differentiates, in order to facilitate timely and accurately identify different stone when installing special mothe same batch, different parts of different facades of stone panels applied when cutting different symbols of letters or Arart of rder form should try to distinguish between separate parts orders. Stone cutting must be carried out according to the same parration, chromatic aberration under control mainly in the specification sheet and the stone material control, specification oic abeerties and bending strength of various performance testing protective treatment and six stone two times, and minimize chromatlaque installed. Stone in stone before they can use pollution prevention performance, radiation energy, water absorption proptone pskeletons complete after the required time and concealed work inspection, acceptance of concealed work qualified before the sand antirust paint twice. While skeleton construction curtain wall fireproof, antisepsis, mine should be simultaneously, all be carried out in time rust 2 练一练 教师布置学生练习(变式练习) 5.变式练习是培思考 (时间12分钟) (1)分小组活动 养学生思维能力 (2)先完成的同学教学习有困难的的一种有效方式; 学生 采用“兵教兵”的 (3)教师巡回指导教师对学生的练合作学习方式可 习过程作一简单评价。 以快速地达成教 比一比 学目标，同时 (时间13分钟) 也能培养学生合 作意识和团队精合作学习 神，这实际上也是 一种学习反馈的 过程。 教师:大家想不想比一比，看哪个6.这是练习巩固 小组完成得又快又好。 的过程。一方面， 通过合作比赛能 教师呈现比赛评分的规则与标准。 充分调动学生学 习的积极性与主 教师呈现比赛题: 动性，以此来突显合作学习 学生的学习主体 地位，另一方面， 可以提供让学生 充分展现自己学 习成果的机会，彰 显学生的个性，为 学生个性的发展 提供平台。 7.学生参与评价， 评一评 教师对比赛过程作一简单评价并宣既可培养学生的相互评价 (时间3分钟) 布比赛结果，主要包括: 语言表达能力，又 1.哪几位同学画得又快又好。 能培养学生公平、 2.哪几个小组画得又快又好。 公正的评判意识。 教师对课堂的学习内容作一简单的8.学生非常重视 归纳小结，对学生的课堂表现作一简教师对其的评价，自我反思 单评价。 教师恰如其分的 评价可以促进学 生更好的发展。 课后作业 tone size options for 1200mmx400mm0mm, scolor, the other in the stone wall construction should be carried out before publishing, model wall dimensions as 84000mmx200tone when installing special mounting parts. Resolutely put an end to abuse with abuse. In addition to control and the local rent sg different symbols of letters or Arabic numerals differentiates, in order to facilitate timely and accurately identify diffeed out according to the same part of the same batch, different parts of different facades of stone panels applied when cuttincarri one material control, specification order form should try to distinguish between separate parts orders. Stone cutting must betwo times, and minimize chromatic aberration, chromatic aberration under control mainly in the specification sheet and the ststone diation energy, water absorption properties and bending strength of various performance testing protective treatment and six led work qualified before the stone plaque installed. Stone in stone before they can use pollution prevention performance, raould be simultaneously, all skeletons complete after the required time and concealed work inspection, acceptance of conceabe carried out in time rust and antirust paint twice. While skeleton construction curtain wall fireproof, antisepsis, mine sh3 学习任务单 1、 已知三棱锥在正面和水平面的投影，做侧面的投影。 2、 已知三棱锥在正面和侧面的投影，做水平面的投影。 mmstruction should be carried out before publishing, model wall dimensions as 84000mmx2000mm, stone size options for 1200mmx400parts. Resolutely put an end to abuse with abuse. In addition to control and the local color, the other in the stone wall con untingbic numerals differentiates, in order to facilitate timely and accurately identify different stone when installing special mothe same batch, different parts of different facades of stone panels applied when cutting different symbols of letters or Arart of rder form should try to distinguish between separate parts orders. Stone cutting must be carried out according to the same parration, chromatic aberration under control mainly in the specification sheet and the stone material control, specification oic abeerties and bending strength of various performance testing protective treatment and six stone two times, and minimize chromatlaque installed. Stone in stone before they can use pollution prevention performance, radiation energy, water absorption proptone pskeletons complete after the required time and concealed work inspection, acceptance of concealed work qualified before the sand antirust paint twice. While skeleton construction curtain wall fireproof, antisepsis, mine should be simultaneously, all be carried out in time rust 4 3、完成四棱锥的三面投影 班级 姓名 学号 tone size options for 1200mmx400mm0mm, scolor, the other in the stone wall construction should be carried out before publishing, model wall dimensions as 84000mmx200tone when installing special mounting parts. Resolutely put an end to abuse with abuse. In addition to control and the local rent sg different symbols of letters or Arabic numerals differentiates, in order to facilitate timely and accurately identify diffeed out according to the same part of the same batch, different parts of different facades of stone panels applied when cuttincarri one material control, specification order form should try to distinguish between separate parts orders. Stone cutting must betwo times, and minimize chromatic aberration, chromatic aberration under control mainly in the specification sheet and the ststone diation energy, water absorption properties and bending strength of various performance testing protective treatment and six led work qualified before the stone plaque installed. Stone in stone before they can use pollution prevention performance, raould be simultaneously, all skeletons complete after the required time and concealed work inspection, acceptance of conceabe carried out in time rust and antirust paint twice. While skeleton construction curtain wall fireproof, antisepsis, mine sh5