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...
- Anonymous9 years agoFavorite Answer
None of these. It's 147*pi.
- jariyaLv 59 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