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OpenStudy (anonymous):
if triangle qrs = triangle tuv, find angle r
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OpenStudy (anonymous):
OpenStudy (p0sitr0n):
it is 90 degrees
OpenStudy (anonymous):
ok
OpenStudy (p0sitr0n):
to deduce this, you have to prove the triangles are similar
OpenStudy (p0sitr0n):
i.e. the ratio of their sides and some known angles are identical
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