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satyendra yadav

· started a discussion

· 1 Months ago

explaination (Question: 215380.0 )

plz give explaination

Question:
Circumference of a circle is equal to 277.2 cm. What is the circumference of another circle whose diameter is seven times the radius of the first circle ?
Options:
A) 902.8 cm
B) 970.2 cm
C) 1078.6 cm 
D) 1940.4 cm 
Solution:
Ans: (b) Circumference of the smaller circle 

= 277.2 cm

Diameter of the bigger circle = 7 × Radius of smaller circle

ATQ,

Circumference of the bigger circle 

= 277.2 × \(\cfrac{7}{2}\)

= 970.2 cm

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