Question

height of equilateral triangle is 9 CM then find its area

Answer 1

Height of a equilateral triangle is = √3/2a

9 = √3/2a

6√3 = a

Ar . of eq. Triangle = √3/4 a×a

=√3/4 × 6√3×6√3

=9× 3×√3

=27√3 cm^2