Equilateral triangle v3

Find the area of the colored gray part. An equilateral triangle has a side length of 8 cm. Arc centers are the vertices of a triangle.

Correct answer:

S =  2.5801 cm2

Step-by-step explanation:

a=8 cm r=a/2=8/2=4 cm A=36060=610.1667 S1=3/4 a2=3/4 82=16 3 cm227.7128 cm2 S2=π r2 A=π r2 61=3.1416 42 0.16678.3776 cm2  S=S13 S2=27.71283 8.3776=2.5801 cm2

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Tips for related online calculators
Calculation of an equilateral triangle.
See also our trigonometric triangle calculator.

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