Question

taking π equals to 3.14 find the diameters of the circle whose areas are 254.34 cm sq​

Answer 1

Answer:3.14*r^2 =254.34

solve this you will get the value of radius

then do 2*r to get the diameter

Answer 2

Given ÷

π = 3.14

area of circle = 254.34cm²

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Concept to find out ...

Diameter of circle =??

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Solution-

Area of circle = π r²

$254.34c {m}^{2} = 3.14 \times {r}^{2} \\ \\ \frac{254.34c {m}^{2} }{3.14} = {r}^{2} \\ \\ {r}^{2} = > 81 \\ \\ r = > 9 \\ \\ d = > r \times 2 \\ \\ d = > 9 \times 2 \\ \\ \boxed{d = > 18}$

The diameter of circle = 18 cm

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Important formula .

(1) Area of circle = πr²

(2) Diameter = radius x 2

(3)Radius = Diameter/2

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Hope it's helps you