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Class 7 - Mathematics - Unit 9: Perimeter and Area - Multiple Choice QuestionsQuestion 21
Class 7 - Mathematics - Unit 9: Perimeter and Area - Multiple Choice Questions
Question. 21
21. Length of tape required to cover the edges of a semicircular disc of radius 10 cm is
(a)
(a) 62.8 cm
(b)
(b) 51.4 cm
(c)
(c) 31.4 cm
(d)
(d) 15.7 cm
Detailed Answer with Explanation:
Perimeter of semicircle = \( \pi r + 2r = 3.14 \times 10 + 20 = 51.4 \, cm \).