Question

find the radius of a circle whose diameter is 16cm
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Answer 1

Answer:

r=8

Step-by-step explanation:

d=16

r=d/2

=16/2

=8

Answer 2

Given :

• diameter = 16cm

To Find :

• find the radius of a circle

Solution :

Concept :

• Find the radius if you know the diameter. The radius is half the diameter, so use the formula r = D/2.

• Find the radius if you know the circumference. Use the formula C/2π.

• Calculate the radius if you know the volume of a sphere. Use the formula ((V/π)(3/4))1/3.

• Find the radius from the surface area.

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$: \implies \: \: \: \: \boxed{ \sf \: Diameter = 2 \times radius}$

Substitute the value of diameter :

$: \implies \: \: \: \: \sf \: 16 = 2 \times radius \\ \\ \\ : \implies \: \: \: \: \sf \: 16 =2r \\ \\ \\ : \implies \: \: \: \: \sf \: r = \cancel{ \frac{16}{2} } \\ \\ \\ : \implies \: \: \: \: \sf \: r = 8$

• Hence the radius of circle is 8