Illustrative Mathematics - Geometry - Unit 3 - Lesson 5

Triangle DEF is formed by connecting the midpoints of the sides of triangle ABC. The lengths of the sides of DEF are shown. What is the length of AB ?

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G.SRT.1.b

G.SRT.1.a

G.SRT.4

G.CO.10

Angle ABC is taken by a dilation with center P and scale factor \frac{1}{3} to angle A'B'C' . The measure of angle ABC is 21o. What is the measure of angle A'B'C' ?

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G.SRT.1.b

G.SRT.1.a

G.SRT.4

G.CO.10

Is it possible for polygon ABCDE to be dilated to figure VWXYZ? Explain your reasoning.

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G.SRT.1.b

G.SRT.1.a

G.SRT.4

G.CO.10

Triangle XYZ is scaled and the image is X'Y'Z'. Write 2 equations that could be used to solve for a.

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G.SRT.1.b

G.SRT.1.a

G.SRT.4

G.CO.10