find the radios of a circle area 38 5 cm2 pi, Circle, Mathematics (O-Level)

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Question:Find the radios of a circle of area 38.5 `cm^2`  (`pi =22/7` ).

Answer `pi r^2` = 38.5

`:. r^2` = `38.5/pi` 

         = `(38.5 xx 7)/22`

         = `(3.5 xx 7)/2`

         = `(3.5)^2` .

   `:.`r = 3.5

The radius of the circle is 3.5 cm

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Find the radios of a circle of area 38.5 `cm^2` (`pi =22/7` ).

Question:Find the radios of a circle of area 38.5 `cm^2` (`pi =22/7` ).

Answer `pi r^2` = 38.5 `:. r^2` = `38.5/pi` = `(38.5 xx 7)/22` = `(3.5 xx 7)/2` = `(3.5)^2` . `:.`r = 3.5 The radius of the circle is 3.5 cm