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72 degrees is the answer for the first one.
are there any hints or solutions here??
OPQRSTUVWX is a regular decagon. A rotation ofdegrees about U maps X to R. Given , find
Two lines and m intersect at O at an angle of . Let A be a point inside the acute angle formed by and m. Let B and C be the reflections of A in lines and m, respectively. Find the number of degrees in .
Equilateral triangle ABC has centroid G. Triangle A'B'C' is the image of triangle ABC upon a dilation with center G and scale factor -2/3. Let K be the area of the region that is within both triangles. Find K/[ABC].