Question

how to find the radius and diameter of the circumference is given???
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Answer 1

Answer:

by formula....

circumference = 2πr

put the value and find .

its very easy....

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Finding the Diameter or Radius

The circumference of a circle is equal to pi times the diameter.

C=πd

The diameter is two times the radius, so the equation for the circumference of a circle using the radius is two times pi times the radius.

C=2πr

If you are given the circumference but not the radius or the diameter, you can still solve for one or the other using these formulas.

Let’s look at an example.

Find the diameter of a circle with a circumference of 21.98 feet.

To work on this problem, you will need the formula for finding the circumference of a circle using the diameter.

C=πd

First, fill in the given information.

21.98=(3.14)d

Next, solve the problem by dividing both sides by 3.14. The 3.14 will cancel out on the right side of the equation, leaving d. Then divide 21.98 by 3.14.

3.14)21.98¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

When dividing decimals, move the decimal point two places to make the divisor a whole number then divide as usual.

7314)2198¯¯¯¯¯¯¯¯¯¯¯¯¯

The answer is, the diameter is 7 feet.

You can use the same approach to solving for the radius as you did the diameter. Just remember to divide the diameter by two to get the radius.

If you were asked to find the radius instead of the diameter, you would simply divide 7 feet by 2 because the radius is one-half the measure of the diameter.

7÷2=3.5

The radius of the circle is 3.5 feet.

You can also use the circumference and radius equation.