the hight of an equilateral triangle is 9cm find
the area of a triangle
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solution-:
Given -: height of equilateral triangle= 9cm
to find -: area of equilateral triangle = ?
Find -: we know height = √3/2(side)
√3/2(side)= 9
side = 9×2/√3
side = 18/√3 cm
Now, area of equilateral triangle = √3/4 (side)²
= √3/4×18×18/√3×√3
= √3/4×324/3
= √3/4×108
= √3×27
= 27√3 cm²
Hence, area of equilateral triangle is 27√3 cm².
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