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  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -




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Topic review (newest first)

2013-07-17 03:47:41

72 degrees is the answer for the first one.

2013-07-17 02:47:06

are there any hints or solutions here??

2013-07-15 03:25:47

OPQRSTUVWX is a regular decagon. A rotation of

degrees 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].

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