Question

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Here's ur question...

An umbrella is made by stitching 12 triangular pieces of cloth, each measuring (50cm × 20cm × 50cm). Find the area of the cloth used in it.

Answer 1

area of 1piece

$s = \frac{a + b + c}{2} \\ s = \frac{20 + 50 + 50 }{2} \\ s = 60 \: cm \\ area = \sqrt{s(s - a)(s - b)(s - c)} \\ = \sqrt{60 \times 40 \times 10 \times 10} \\ = 10 \times 10 \sqrt{24} \\ = 200 \sqrt{6} \: {cm}^{2}$

there are 12 strips so

$total \: area = 12 \times (200 \sqrt{6)} \\ = 2400 \sqrt{6}cm {}^{2}$


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Answer 2

hope it will be helpful for you