Question

Find the area of an equilateral triangle each of whose side measure 1. 18cm. 2. 20cm

Answer 1

apply the formula

area=(√3)/4*a^2

where a = 18 and 20cm

Answer 2

area of equilateral triangle =

$= \frac{ \sqrt{3} }{4} \times {l}^{2} \\ = \frac{ \sqrt{3} }{4} \times 18 \times 18 \\ = \frac{ \sqrt{3} }{4} \times 324 \\ = 81 \sqrt{3} {cm}^{2}$

2nd one

$= \frac{ \sqrt{3} }{4} \times {l}^{2} \\ = \frac{ \sqrt{3} }{4} \times 20 \times 20 \\ = 100 \sqrt{3} {cm}^{2}$

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mark as brainliest answer.