Question

find the area of an isosceles right angled triangle if one of the right sides is 20 CM long

Answer 1

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Answer 2

$\large \bold{ \underline{ \underline{ \: \sf Answer : \: \: \: }}}$

$\to$ The area of an isosceles triangle is 200 cm²

$\large \bold{ \underline{ \underline{ \: \sf Explaination : \: \: \: }}}$

Given ,

Side of isosceles triangle = 20 cm

We know that ,

$\large {\bold{ \fbox{ \fbox{ \sf \: Area \: of \: isosceles \: \triangle = \frac{1}{2} \times {(side)}^{2} }}}}$

$\to \sf{Area \: of \: isosceles \: \triangle = \frac{1}{2} \times {(20)}^{2} } \\ \\ \to \sf{Area \: of \: isosceles \: \triangle = \frac{1}{2} \times 400 } \\ \\ \to \sf{Area \: of \: isosceles \: \triangle = \frac{400}{2} } \\ \\ \to \sf{Area \: of \: isosceles \: \triangle = 200 \: \: {cm}^{2} }$

$\therefore$ The area of isosceles triangle is 200 cm²