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The formula for the area of a circle is A = πr2, where π is pi, which is 3.14159 rounded to five decimal places, and r is the radius of the circle. Radius is half the diameter of a circle. The radius is a distance measurement, such as meters or feet. Suppose you have a circle with a radius of 0.25ft.
A = πr2 = 3.14159 x (0.25ft)2 = 3.14159 x 0.0625ft2 = 0.19635ft2
If you look carefully, you will see that the radius, a distance measurement, is squared, so the area of a circle will always be a squared distance measurement, such as ft2, in2, m2, cm2, etc... .
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What is the measure of the inside of the circle?
It is its square area which is found by pi*radius squared
What is the area of the semi-circle above?
to find the area of a semi circle measure the length of the straight edge, divide by 2, square it and multiply by pi. This will give you the area of the circle. To get the area of the semi-circle divide your answer by 2
What is the Measure remaining area outside a circle within a square?
A circle within a square has a diameter equal to the side of the square = ' D '. Area of the square = D2 Area of the circle = pi R2 = pi (D/2)2 = pi/4 D2 Area inside the square but outside the circle = D2 - (pi/4 D2) = (1 - pi/4) D2 = 0.2146 D2(rounded)
What is the area of a sector of a circle that has an arc measure of 75 degrees and a diameter of 15.75?
Area of the circle = pi*7.8752 = 194.8278319 square units Area of sector = 75/360 times 194.8278319 = 40.58913165 square units
How do you measure the area of a circle in square feet?
The radius (in feet) squared times PI (3.14159...)
