Length of tape required to cover the edges of a semicircular disc of radius 10 cm is
(a) 62.8 cm
(b) 51.4 cm
(c) 31.4 cm
(d) 15.7 cm
Solution:
Given, a semicircular disc of radius 10 cm
We have to find the length of tape required to cover the edges of a semicircular disc.
Perimeter of semicircle = circumference of semicircle + diameter
Circumference of semicircle = πr
Where, r is the radius of circle
= 22/7 × 10
= 22(10)/7
= 220/7
= 31.4 cm
Perimeter of semicircle = 31.4 + 10(2)
= 31.4 + 20
= 51.4 cm
Therefore, the perimeter of semicircle is 51.4 cm
✦ Try This: Length of tape required to cover the edges of a semicircular disc of radius 8 cm is
☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 11
NCERT Exemplar Class 7 Maths Chapter 9 Problem 21
Length of tape required to cover the edges of a semicircular disc of radius 10 cm is (a) 62.8 cm, (b) 51.4 cm, (c) 31.4 cm, (d) 15.7 cm
Summary:
Length of tape required to cover the edges of a semicircular disc of radius 10 cm is 51.4 cm
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