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12 April, 18:43

An umbrella is made by stitching 10 triangular pieces of clothes of 2 different colors, each piece measuring 9 cm, 40 cm and 41 cm. How much clothes is required for the umbrella? If the cost of 1 cm square cloth is Rs. 0.25, find the total cost of the clothes.

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  1. 12 April, 20:09
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    See below in bold.

    Step-by-step explanation:

    The triangular piece of cloth is a right triangle because 41^2 = 40^2 + 9^2 (By the Pythagoras theorem).

    So the area of one piece = 1/2 * 9 * 40 cm^2.

    The total amount of cloth required for one umbrella = 10 * 1/2 * 9 * 40

    = 1800 cm^2.

    The total cost = 1800 * 0.25 = Rs 450.
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