Equilateral 5140

I have a circle with a diameter of 6.4 cm. I need to find out the length of the side of an equilateral triangle inscribed in a circle.

Correct answer:

a =  5.5426 cm

Step-by-step explanation:

D=6.4 cm r=D/2=6.4/2=516=3.2 cm A=(360/3)/2=60 a=2 r sin(A° rad)=2 r sin(A° 180π )=2 3.2 sin(60° 1803.1415926 )=5.543=5.5426 cm

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