Math Practice Online: MathScore.com

Math Practice Online > free > lessons > California > 7th grade > Irregular Shape Areas

If your child needs math practice, click here.

For sample problems, click here.
Here are some tips for Irregular Shape Areas, which aligns with California state standards:

Irregular Shape Areas


In this topic, you will find the difference between the areas of two shapes.
It is a good idea to brush up on shapes and area formulas.

 
Square:
A square has 4 equal sides, s.
The diagonal has length s2.
Area = s2
  Equilateral Triangle:
An equilateral triangle has 3 equal sides, a.
The height has length a3/2.
Area = a23/4.
 
Right triangle:
Pythagorean theorem applies to right triangles.
Side c is the longest side.
a2 + b2 = c2
  Circle:
d = 2r
Area = π r2

Copyright Accurate Learning Systems Corporation 2008.
MathScore is a registered trademark.