find the radius of a circle if perimeter is 75
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Answer:
perimeter of a circle is 2πr
given perimeter = 75
now equate ===> 75 = 2πr ==> r = 75/2π ==> ,75/6.28===> approximately you will get 12 units
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Step-by-step explanation:
Perimeter of quadrant of circle=2(r) + 1/4×2πr
75=2r+½×22/7r
75=2r+11/7r
75=25r/7
\begin{gathered}r = 75 \times \frac{7}{25} \\ r = 7 \times 3 = 21 \: cm\end{gathered}
r=75×
25
7
r=7×3=21cm
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