.9 The cap of a joker is conical in which 30.8 sq. cm of cloth is used. Also the circumference of base is 17.6 cm. I- The radius of the base of the ccap is a) 2.1 cm b) 2.4 cm c) 2.8 cm d) 4.2 cm
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Answer:
c)2.8cm
Step-by-step explanation:
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The radius of the base of the joker's cap is 2.8 cm.
Given:
area of the cloth used in making a conical cap = 30.8 sq cm
the circumference of the base of a conical cap is = 17.6 cm
To Find:
the radius of the base of the cap
Solution:
the formula for calculating the circumference of a circle is = 2πr
where r is the radius
substituting the values into the formula we get,
17.6 = 2πr
r = 17.6/(2 × 3.14)
r = 17.6/6.28
r = 2.8
Thus, the radius of the base of the joker's cap is 2.8 cm.
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