New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    If the lengths of the diameters of two concentric

    circles are 16cm and 18cm respectively, then what will be the area of the region between them?
    A 7π cm² Correct Answer Incorrect Answer
    B 25π cm² Correct Answer Incorrect Answer
    C 17π cm² Correct Answer Incorrect Answer
    D 28π cm² Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Length of diameter of small circle = 16cm  Radius (r) = 16/2 = 8cm Length of diameter of big circle = 18cm  Radius (R) = 18/2 =9cm  Area of the circle = πr² Area of the region between them = πR² - πr² =π (81-64) = 17π cm²

    Practice Next