To recall, the area is the an ar that lived in the form in a two-dimensional plane. In this article, girlfriend will discover the area the a circle and the formulas because that calculating the area that a circle.
You are watching: Find the area of a circle with a diameter of 22 inches. use 3.14 for pi.
What is the Area that a Circle?
The area of the one is the measure of the room or region enclosed inside the circle. In an easy words, the area of a circle is the total variety of square devices inside the circle.
For example, if you draw squares of size 1cm by 1cm inside a circle. Then, the total variety of full squares located inside the circle represents the area the the circle. We have the right to measure the area the a one in m2, km2, in2, mm2, etc.
Formula for the Area of a Circle
The area that a circle have the right to be calculated using 3 formulas. This formulas are applied depending top top the info you are given.
Let us comment on these formulas because that finding the area the a circle.
Area the a circle utilizing the radius
Given the radius of a circle, the formula for calculating the area that a circle states that:
Area the a one = πr2 square units
A = πr2 square units
Given the diameter,
A = πd2/4 square units
= 3.14 x 502/4
= (3.14 x 50 x 50)/4
Calculate the area the a dinner plate, which has actually a diameter the 10 cm.
A = πd2/4 square units
= 3.14 x 102/4
= (3.14 x 10 x 10)/4
= 78.5 cm2
The diameter of a circular plate is 20 cm. Discover the dimensions of a square plate the will have the very same area as the one plate.
Equate the area of the circle to the area that the square
πd2/4 = s2
3.14 x 202/4 = s2
Find the square root of both political parties to get,
s = 17.72
Therefore, the size of the square plate will certainly be 17.72 cm by 17.72 cm.
Find the diameter the a circle through an area that 156 m2.
A = πd2/4
156 = 3.14d2/4
Multiply both political parties by 4.
624 = 3.14d2
Divide both sides by 3.14.
198.726 = d2
d = 14.1 m
Thus, the diameter that the circle will certainly be 14.1 m.
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Area that a circle using the circumference
As we already know, the circumference of a circle is the distance approximately a circle. The is feasible to calculation the area that a circle offered its circumference.