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Transcript
Glencoe Geometry Interactive Chalkboard Copyright © by The McGraw-Hill Companies, Inc. Developed by FSCreations, Inc., Cincinnati, Ohio 45202 Send all inquiries to: GLENCOE DIVISION Glencoe/McGraw-Hill 8787 Orion Place Columbus, Ohio 43240 Click the mouse button or press the Space Bar to display the answers. Lesson 4-1 Classifying Triangles Lesson 4-2 Angles of Triangles Lesson 4-3 Congruent Triangles Lesson 4-4 Proving Congruence–SSS, SAS Lesson 4-5 Proving Congruence–ASA, AAS Lesson 4-6 Isosceles Triangles Lesson 4-7 Triangles and Coordinate Proof Example 2 Exterior Angles Example 3 Right Angles OBJECTIVE: To apply the Exterior Angle Theorem (2.9.8D) (M8.C.1.1) Theorem 4.2 – Third Angle Theorem: If 2 angles of one triangle are congruent to two angles of a second triangle, then the third angles of the triangles are congruent Theorem 4.2 – Exterior Angle Theorem: The measures of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles. Find the measure of each numbered angle in the figure. Exterior Angle Theorem Simplify. If 2 s form a linear pair, they are supplementary. Substitution Subtract 70 from each side. Exterior Angle Theorem Substitution Subtract 64 from each side. If 2 s form a linear pair, they are supplementary. Substitution Simplify. Subtract 78 from each side. Angle Sum Theorem Substitution Simplify. Subtract 143 from each side. Answer: Find the measure of each numbered angle in the figure. Answer: GARDENING The flower bed shown is in the shape of a right triangle. Find if is 20. Corollary 4.1 Substitution Subtract 20 from each side. Answer: The piece of quilt fabric is in the shape of a right triangle. Find if is 32. Answer: End of Custom Shows WARNING! Do Not Remove This slide is intentionally blank and is set to auto-advance to end custom shows and return to the main presentation.