Triangles Lesson Plan 三角形.doc

LESSON PLAN FORMATCourse: Bilingual mathematicsGrade Level: Grade 1Teacher:Bela Date:Title: TrianglesContent: TrianglesPRE-LESSON PLANNINGLearning Objectives1. To teach the properties of triangles and apply them to solve problems.2. To let students know the different types of triangles and what the classify according to Design the AssessmentDesign Assessment Rubric (if Needed)TEACHING THE LESSONVocabulary:Scalene triangle 不等边三角形 isosceles triangle 等腰三角形Equilateral triangle 等边三角形 acute-angled triangle 锐角三角形Right-angled triangle 直角三角形 obtuse-angled triangle钝角三角形 Materials: Ruler procedure1. Revision Review the key points that we learned last class.About the relationships between angles.2. Lead in Introduce some application about triangles in our daily life .Then lead in to what we will learn in this class.3. Cooperation studyStep 1 The triangles Triangle a plane shape with 3 angles and 3 straight sides. Property of triangles : the sum of all the angles equals 180 degrees. Two interior angles of a triangle are equal to the opposite exterior angle. Step 2 What is the missing angle? Step 3 Different Types of TrianglesThere are several different types of triangles. You can classify a triangle by the length of its sides and the sides of its angles.There are THREE different classifications for triangles based on their sides.SCALENE no sides congruentscaleneISOSCELES at least two sides congruentisoscelesEQUILATERAL 3 congruent sidesequilateralStep 4There are FOUR different classifications for triangles based on their angles.EQUIANGULAR all angles are congruentACUTE all angles are acuteRIGHT one right angleOBTUSE one obtuse angleGuided Practice 1. If a triangle has three unequal sides it is a _ triangle.A) ScaleneB) ObtuseC) Isosceles2. A triangle which has three equal angles is a _ triangle.A) AcuteB) EquilateralC) Equiangular3. A triangle with (at least) two equal sides is a _ triangle.A) ScaleneB) IsoscelesC) CongruentCheck for student understanding by: 1. Two triangles that are equal are called _ trianglesA) Acute B) Obtuse C) Congruent 2. A triangle with all three sides of equal length is a _ triangle.A) EquilateralB) RightC) Equiangular3. A triangle with an angle of 90 is a _ triangle.A) AcuteB) RightC) CongruentClosing Activity Summarizing the Learning1. The angle properties of triangles 2. The different types of triangles.STUDENT WORKIndependent Practice1. A triangle in which all three angles are less than 90 is a _ triangle.A) RightB) AcuteC) Scalene2. A triangle in which one of the angles is greater than 90 is a _ triangle.A) ObtuseB) IsoscelesC) Acute3. What is the Hypotenuse of a right triangle?A) The smallest angle.B) The side opposite the right angle.C) The right angle.4. The Pythagorean Theorem states A) pr2B) (a+b)2/2=cC) a2+b2=c25. Use the Pythagorean Theorem to solve the following:a = 5b = 12c = ?POST LESSON ACTIVITIES S