Anonymous asked in Science & MathematicsMathematics · 9 years ago

The area of the in-circle of an equilateral triangle side 42 cm is ?

A) 472 cm^2

B) 231 cm^2

C) 22root3 cm^2

D) 924 cm^2


Can u tell me the steps...

2 Answers

  • Anonymous
    9 years ago
    Favorite Answer

    None of these. It's 147*pi.

  • jariya
    Lv 5
    9 years ago

    I get 462 cm^2 so the closest answer is A

    well draw the picture fist Any euilateral triangle has 60 degrees to all its angles

    Tan 30 = radius /(42/2)= .58 , radius= 21x.58=12.12 cm

    area of circle= pir^2= 22/7x 12.12^2= 462cm^2

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