Question

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Answer 1

h^2=b^2+l^2

h^2=(15/2)^2+15^2

h^2=1125/4

h=(root5)15/4

Answer 2

Step-by-step explanation:

We know the area of equilateral triangle

$\frac{ \sqrt{3} }{4} {a}^{2} \\ \\ \frac{ \sqrt{3} }{4} \times 15 \times 15 \\ \\ = \frac{225 \sqrt{3} }{4} \\ \\ we \: know \: the \: area \: of \: triangle \\ \\ \frac{225 \sqrt{3} }{4} = \frac{1}{2} \times b \times h \\ \\ \frac{225 \sqrt{3} }{4} \times 2 \times \frac{1}{15} = h \\ \\ 7.5{ \sqrt{3} } \\ \\ put \: the \: value \: of \: \sqrt{3} \\ \\ = 7.5 \times 1.73(approx) = h \\ \\ 12.975 \: \: \: {cm}^{2} (approx)$