If the perimeter of an equilateral triangle is 9 cm. Then its area is ………….sq. cm.
Answers
Answered by
0
3a=9
a=3
area=root 3/4×a²
=root3/4×3×3
=root3/4×9
=9 root 3/4
.......
Answered by
0
A=√3/4a2
P=3a
Solving forA
A=√3(P)2/36
=√3·(9)2/36
≈3.89711
Similar questions