3.4 Using Similar Triangles For use with Activity 3.4
Essential Question How can you use angles to tell whether triangles are
similar?
ACTIVITY: Constructing Similar Triangles
Work with a partner.
• Use a straightedge to draw a line
segment that is 4 centimeters long.
• Then use the line segment and a
protractor to draw a triangle that
has a 60° and a 40° angle as shown.
Label the triangle 1BC.
40
a. Explain how to draw a larger triangle that has the same two angle
measures Label the triangle JhL
b. Explain how to draw a smaller triangle that has the same two angle
measures. Label the triangle POR
. Are all of the mangler xplain
Copyright beldes
Alle
Big Ideas Math Blue
Record and Practice Journal
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