Question

A
Find the area of an en
ea of an equilateral triangle of side 10 cm.

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Answer 1

Answer:

Side=10cm

Area of an equilateral triangle=

$= \sqrt{3} a^{2} \div 4$

$= \sqrt{3 } \times 10 {}^{2} \div 4$

$= \sqrt{3} \times 100 \div 4$

$= 100 \sqrt{3} \div 4$

$= 20 \sqrt{3}$

$area \: of \: triangle \: = 20 \sqrt{3}$