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    Question

    The perimeter of a sector of a circle, whose radius is

    22 cm, is 64 cm. If the length of a rectangle is 10 cm more than the arc subtended by the sector and its perimeter is 80 cm, then find the area (in cm2) of the rectangle.
    A 310 Correct Answer Incorrect Answer
    B 320 Correct Answer Incorrect Answer
    C 300 Correct Answer Incorrect Answer
    D 330 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the arc subtended by the sector be ‘l’ cm and the radius of the circle be ‘r’ cm According to the question, (l + 2r) = 64 Or, l = 64 – 2r = 64 – (2 × 22) = 20 cm Therefore, length of the rectangle = 20 + 10 = 30 cm Let the breadth of the rectangle be ‘b’ cm Therefore, 2 × (30 + b) = 80 Or, b = 40 – 30 = 10 cm Therefore, area of the rectangle = length × breadth = 10 × 30 = 300 cm2

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