An equilateral

An equilateral triangle with a side 10 m represents a wooden platform standing in a lawn. A goat is tied to a corner with a 15 m rope. What is the maximum amount of grazing area available to the goat?

Correct result:

S =  663.5571 m2


a=10 m r=15 m  S1=3/4 a2=3/4 102=25 3 m243.3013 m2  S2=π r2=3.1416 152706.8583 m2  S=S2S1=706.858343.3013=663.5571 m2

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