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Why do we multiply radius two times it self to get the area of a circle why not diameter?

Updated: 9/27/2022

Wiki User

8y ago

It's simply because the area of a circle is defined as pi * r * r.

Wiki User

8y ago

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Q: Why do we multiply radius two times it self to get the area of a circle why not diameter?
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What is the diameter d of a circle of radius 13.8 cm?

The diameter is twice the radius (that is, multiply the radius times 2).

How do you find out the circumfrance of a circle?

To find the circumfrance of a circle, you need to multiply 2 times pi, times the circle's radius. If you don't know what that is, you multiply two times pi, and pi equals 3.14, and then multiply that by the radius, which is the measurement of half the circl'e diameter. the diameter is the distance from one side of the circle, to the exact opposite. you measure this with a ruler. HALF the measurement of the diameter is the radius. Example---the diameter of a circle is 20 cm. half the diameter is 10 cm, which is the radius. Multiply 2 times pi[which equals 3.14], times the radius. Good luck!

How do you find the circumference from the area?

Well, you find the area of a circle by multiplying (pi times radius2) or (pi times radius times radius). The radius is half of the diameter. The formula for the circumference is (pi times diameter). Multiply the radius times 2 to get the diameter. Multiply the diameter times pi.

How you find the diameter if you are given the radius?

What you would do is just multiply the radius by 2 because radius is 1/2 of the diameter.Example:A circle has a radius of 8 cm. What is the diameter?Just multiply 8 times 2 = 16The diameter of the circle is 16 cm.

How do you find area in a circle?

MULTIPLY THE DIAMETER TIMES PI(3.14) OR MULTIPLY THE RADIUS TIMES 2 TIMES PI(3.14).

How to find the circumference?

To find the circumference of a circle you multiply the diameter by pi (3.14), the diameter is two times the radius.

How do you find the diameter?

The diameter of a circle is the length of a straight line drawn through the center of the circle to its edges.Or, measure the circumference of the circle and divide by pi (3.14159).Or you can multiply the radius times twoTo get diameter you have to find the radius and then double it to get the diameter

How do you find the area of a circle when you are only given its perimeter?

The Perimeter of a circle is it's circumference. And the circumference is the diameter times pi. So to find the area, divide the circumference by pi, and get the diameter. Then divide the diameter by 2, to get the radius. Then multiply the radius times itself, and multiply that by pi.

the radius is a line from the middle of a circle to a point of the circle. the diameter is two times the radius.

What is the circumference of a 12 foot diameter circle?

Circumference= 37.68 feet. All you have to do is multiply the diameter by pi. Same with radius. Multiply the radius by two to get the diameter then do diameter times pi.(pi= 3.14 or 22 over 7.)

A circle has a radius of 12 in Find the diameter of the circle?

diameter is 2 times the radius 24

How do you find the diameter if you have the area of a circle?

Since the area of a circle is (Pi)times(Radius squared) then you would reverse the process to find the radius, and hence, the diameter. Divide the area by Pi (3.14159...) and you would have the radius squared. Take the square root of that and you have the radius. To get the diameter, multiply the radius by 2.