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Help. Its a math problem circle |
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Answer» 88 cm. (C)Explanation: GIVEN that, DIAMETER of circular PATTERN = 28 cm. ∴ Radius = d/2 = 28/2 cm = 14 cm. Here, PERIMETER of shaded region = Semi-perimeter of the big circle + 2(Semi-perimeter of the small, congruent circles.) = ½(2πR) + 2[½(2πr)] {Small circles are same or congruent as radius are equal. Semi-perimeter means HALF of the perimeter and R = radius of bigger circle = 14 cm. r = R/2 = 7 cm.}= πR + 2πr = 22/7 × 14 cm + 2 × 22/7 × 7 cm = 44 cm + 44 cm = 88 cm.Point to keep in mind: Perimeter = measurement of the boundary. |
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