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Mathematics

Grade-7

Easy

Question

The floor of a new butterfly conservatory will be a circle with an 18-foot radius. The material for the floor will cost $3.95 per square foot. The cost of flooring will be __________. (Take $pi$ = 3.14)

1564
1017
4018
3545

The correct answer is: 4018

floor which is a circle with 18 foot radius
material for the floor will cost $3.95 per square foot.
total area of the floor that is a circle which radius is 18 foot
is $area space equals space straight pi space straight r squared space space space here space straight r space equals space 18 space foot area space equals space 3.14 space cross times space 18 squared area space equals space 3.14 space cross times space 18 space cross times 18 area space equals space 1017.36 space square space foot cost space for space the space material space is space $ 3.95 space per space square space foot space left parenthesis space one space square space foot right parenthesis so space the space cost space of space space 1017.36 space square space foot space equals space 1017.36 space cross times 3.95 1017.36 space cross times 3.95 4018.572 $ space answer$

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