Hence circumference of the circle =2π(7)=2⋅722⋅7=2⋅22=44 cm.

The radius of the circle is 7 cm and finds its circumference and area. Hint: We will put the value of radius r=7cm in the formula of area of circle that is πr2 and the circumference in the very same way πd . And here d is diameter which is equal to 2r.

If you want an exact answer, you can multiply 7 by the value of π , that is ≈3.14 .

The formula is simply this: C = πd. In this equation, “C” represents the circumference of the circle, and “d” represents its diameter. That is to say, you can find the circumference of a circle just by multiplying the diameter by pi.

We use this because it is easy to measure the diameter of a circle. It’s not really tricky. The diameter is ALWAYS approximately 3 times smaller than the circumference! Or to put it another way, the circumference is approximately 3 times bigger than the diameter.

Diameter = 14cm. So radius = 14/2 cm = 7cm. Circumference = 2 pi r. So, circumference = 2 × 7 × 22/7 = 44cm.

The distance around a rectangle or a square is as you might remember called the perimeter. The distance around a circle on the other hand is called the circumference (c). Half of the diameter, or the distance from the midpoint to the circle border, is called the radius of the circle (r).

Finding the Diameter or Radius 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.

Diameter of a circle The diameter is the length of the line through the center that touches two points on the edge of the circle.

Diameter of a Circle

The radius of a circle is the length of the line segment from the center of a circle to a point on the circumference of the circle. It is generally abbreviated as ‘r’.

Press the pi key, which will be represented as “pi” or “π”. If you calculator does not have a key for pi, enter “3.142” with the keypad. Press “Enter” or the equal sign (“=”) to calculate the diameter. Concluding this example, the diameter equals approximately 190.986.

Calculate the Diameter of a Circle, from Its Area

1. Divide the area (in square units) by Pi (approximately 3.14159). Example: 303,000/3.14159 = 96447.98.
2. Take the square root of the result (Example: 310.56). This is the radius.
3. Now double the radius to get the diameter (Example: 621.12 meters).

The Radius is the distance from the center outwards. The Diameter goes straight across the circle, through the center. The Circumference is the distance once around the circle.

The diameter is a straight line that passes through the center of the circle. The radius is half of the diameter. It starts from a point on the circle, and ends at the center of the circle.

Here is the answer to questions like: how to find the area of a circle with diameter 60 inches?…What is the area of a circle with diameter 60 inches?

Multiply the radius by 2 to get the diameter.

r = 10/pi is approximately 3.18 feet.

Diameter of a Circle

Diameter of a Circle