Question

From a rectangular sheet of paper ABCD with AB = 40 cm and AD = 28 cm, a semi-circular portion with BC as diameter is cut off. Find the area of remining paper​

Answer 1

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Answer 2

Answer:

Length of paper, AB = l = 40cm

Width of paper, AD = b = 28cm

Area of paper = l × b = 40 × 28 = 1120 cm²

Diameter of semi-circle = 28cm

∴ Radius of semi-circle, r = 14cm

Thus, area of semi-circle = 1/2 πr²

= 1/2 × 22/7 × 14 × 14

= 308 cm²

∴ Area of remaining paper = 1120 – 308

= 812 cm²