What would you like to measure?
\Area is the measurement of the 2-demensional size of an object.
The area of a rectangle:
the length of the rectangle times the width
Example: a rectangle that is 4 inches long and 5 inches wide has an area of 4*5=20 square inches.
The area of a triangle:
the length of the triangle times the height all divided by two
As you can see, when two triangles are put together by their hypotenuses, they form a rectangle with the demensions of the length of a side of the triangle and the height of the triangle. Since there are two triangles you have to divide the area of the rectangle by two.
Example: a triangle with the length 5 and the height 4 has an area of 5*4/2=20/2=10
Area of a Circle:
the area of a circle is pi times the radius squared.
If you are given the diameter of a circle, you can still figure out the area. The radius is half of the diameter. Once you have the radius of any given circle, you square it and then times that by pi (about 3.14159). It is completely fine to leave it in terms of pi, in fact it is more acurate and easier to do.
Example: if a circle has a diameter of 12 inches, the radius is half of that, which is 6. 6 squared (6*6) is 36 and then times that by pi and you get 36pi squared inches, or about 113.09 squared inches.
Find out more about the area of geometric shapes!