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Geometry 8 Online
OpenStudy (anonymous):

Given triangle RST=NPQ , m

Directrix (directrix):

@JoeJoldin If these triangles (triangle RST≅ NPQ), then the corresponding angles are congruent. <R and <N are corresponding angles. So, -7x + 9 = -10x --> Solve for x. Then, substitute the value of x you derived into the algebraic expressions for the two angles to get the measures.

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