Question

Find the area of an isosceles right - angled triangle if one of the equal sides is 20 cm long.

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Answer 1

Answer:

area of isosceles right triangle

\begin{gathered} = \frac{1}{2} \times {side}^{2} \\ = \frac{1}{2} \times {20}^{2} \\ = \frac{1}{2} \times 20 \times 20 \\ = 10 \times 20 \\ = 200 {cm}^{2} \\ \end{gathered}

=

2

1

×side

2

=

2

1

×20

2

=

2

1

×20×20

=10×20

=200cm

2