the martin want to buy a new computer. the regular price is $632 . the store is offering a 25% discount and a sales tax of 7% is
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Let r be a radius of a given circle and α be an angle, that corresponds to a sector.
The circle area is
and denote the sector area as 
.
Then
(the ratio between area is the same as the ratio between coresponding angles).
.
The circle area is
Then