Mathematics, 16.10.2020 21:01 historyfanboy101
Lesha wants to prove that the measures of the 3 angles in a triangle always have a sum of 180°. She decided to prove
this conjecture using rigid motion. She began with triangle ABC shown in Figure 1.
Which statement best describes the rigid motion she used in Figure 2 to support her proof?
A. Reflect triangle ABC across AB and across AC.
B. Rotate triangle ABC 180° about the midpoint of AB and about the midpoint of AC.
C. Translate triangle ABC along directed line segment AD and along directed line segment AE.
D. Reflect triangle ABC across AB and then translate the image along directed line segment DE.
Answers: 3
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Lesha wants to prove that the measures of the 3 angles in a triangle always have a sum of 180°. She...
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