How to Find the Area in Math

You can find the surface area of a ball with a formula.
••• Jupiterimages/Goodshoot/Getty Images

Finding the area of a shape is very simple, as long as you know the proper formula. The most common shapes to find the area of are rectangles and circles. Each of these shapes has its own distinct area formula. To find the area of a circle, you will need to use a calculator that has a button for pi. If you are using a calculator that does not have this button, you can approximate the area by substituting 3.1415 for pi.

    Multiply the length of a rectangle by its width to find its area. For example, if a rectangle has a length of 7 feet and a width of 4 feet, its area is 28 square feet.

    Divide a circle's diameter by 2. This will give you its radius. For example, if a circle has a diameter of 20 feet, its radius is 10 feet.

    Square the circle's radius, which means multiply it by itself. Using the example, 10 x 10 = 100.

    Multiply the number obtained in Step 3 by pi. This will give you the area of the circle (100 x pi= 314.15 square feet).

Related Articles

How to Calculate a Circular Area
How to Find the Radius of a Circle
How to Measure Area
How to Calculate Area in Square Inches
How to Calculate the Volume of an Octagon
How to Calculate the Area & Circumference of a Circle
How to Calculate the Diameter of a Circle From a Linear...
How to Calculate the Volume and Circumference of a...
How to Find the Radius
How to Calculate Lateral Area
How to Convert Square Dimensions to Round
How to Calculate the Radius From the Circumference
How to Figure the Cubic Yards in a Circle
How to Find the Cross Sectional Area of a Pipe
How to Calculate the Square Feet on a Cube
How to Find the Area & Width of a Rectangle
How to Find Dimensions in Geometric Shapes
How to Find the Circumference of a Circle
How to Calculate Volume of a Circular Cylinder
How to Calculate Arc Area

Dont Go!

We Have More Great Sciencing Articles!