An isosceles triangle, a rectangle and two diagonals. What is the proportion green : blue?
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The proportion green : blue is 5 : 16.
The fastest solution uses the fact that the five vertices lie on a circle of radius 5 as shown above. Using the fact that equal chords have equal angles it is evident that both triangles are similar. Their areas therefore are proportioned as the square of corresponding sides. In this case 20/64.
It can be a shelter
Where you can go or enter
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