Mathematics
Grade-7
Easy

Question

Determine the area of the circle having 9 meters as its diameter.

  1. 49
  2. 63.5
  3. 64
  4. 25

hintHint:

we know the diameter = 2 x radius

The correct answer is: 63.5


    w e space k n o w space d i a m e t e r space equals space 2 cross times r
s o space r space equals space fraction numerator d i a m e t e r over denominator 2 end fraction space equals space 9 over 2
s o space r left parenthesis r a d i u s right parenthesis space equals space 4.5
w e space k n o w space t h e space f o r m u l a space f o r space c i r c l e space o f space a r e a space equals space straight pi cross times straight r squared
area space equals space 3.14 space cross times space 4.5 space cross times 4.5
area space equals space 63.585 space square space meter

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