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natita [175]
3 years ago
15

A circle has an area of 78.5 square inches what is the radius of the circle

Mathematics
2 answers:
Alinara [238K]3 years ago
3 0

Answer:

Step-by-step explanation:

Area of circle = 78.5 in²

πr² = 78.5

3.14*r² = 78.5

r^{2}=\frac{78.5}{3.14}\\\\=\frac{78.5*100}{3.14*100}\\\\=\frac{7850}{314}\\\\r^{2}=25\\r=\sqrt{25}=\sqrt{5*5}\\\\

r =  5 in

Alexxandr [17]3 years ago
3 0

Answer:

area = \pi \times r ^{2}  \\   78.5 = 3.14 {r}^{2}  \\  \frac{78.5}{3.14}  =  \frac{3.14 {r}^{2} }{3.14}  \\   {r}^{2}  = 25 \\ r =  \sqrt{25}  \\ r = 5inches

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