Question

15. What is the radius of a circle that has a circumference of 3.14 meters?


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Answer 1

$\mathbf\blue{Question}$

15. What is the radius of a circle that has a circumference of 3.14 meters?

$\mathbf\pink{Solution}$

Circumference of a circle = 2πr.

$\mathbb\red{Given \: -}$

circumference = 3.14 meters.

$\mathtt\purple{therefore ,}$

2πr = Circumference of a circle

or, 2πr = 3.14.

or, 2 × 3.14r = 3.14,[Putting the value of pi (π) = 3.14].

or, 6.28r = 3.14.

or, r = 3.14/6.28.

or, r = 0.5.

Hope it's helpful for you .

Answer 2

Answer:

Given

circumference= 3.14 metres

To find

radius

solution

We know that the circumference of the circle is given as-:

$\bold \pink{circumference= 2πr}$

$\sf{ \to \color{orange} \: Let \: us \: assume \: the \: unknown \: value \: of \: radius \: as \: R}$

$\sf{ \implies \: 3.14= 2×3.14× R} \\ \\ \sf{ \implies R = \frac {3.14}{2×3.14} }\\ \\ \sf{ \implies R=\frac{1}{2} }\\ \\ \sf{ \implies \color{red}R= 0.5 \: metres }$

Therefore the radius is of length 0.5 m.

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More to know !!

✏️ circumference of a semi circle- (πr + 2r)

✏️ area of a circle= (πr²)

✏️ area of a semicircle= 1/2(πr²)

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