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Areas

Formulas and instructions for finding the areas of circles, kites, parallelograms, rectangles, rhombi, squares, trapezoids and oddly shaped geometric objects
Just scroll down or click on what you want and I'll scroll down for you!
 

area of a circle area of a kite area of a parallelogram
area of a rectangle area of a rhombus area of a square
area of a trapezoid area of an oddly shaped
geometric region
 

 

The area of a circle:

circle graphic

Area = circle graphic
where r = the radius of the circle
and pi = 3.141592...

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The area of a kite:
To find the area of a kite, multiply the lengths of the two diagonals and divide by 2 (same as multiplying by 1/2):

Area of kite = (1/2)ab

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The area of a parallelogram:

parallelogram To find the area of a parallelogram, just multiply the base length (b) times the height (h):

Area = b x h

Go here to see where this formula comes from!

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The area of a rectangle:

rectangle

To find the area of a rectangle, just multiply the length times the width:

Area = L x w

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The area of a rhombus:
To find the area of a rhombus, multiply the lengths of the two diagonals and divide by 2 (same as multiplying by 1/2):

Area of a rhombus = (1/2)ab

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The area of a square:
To find the area of a square, multiply the lengths of two sides together...  Another way to say this is to say "square the length of a side!"  Get it?  Square!

Area = x*x  = x^2

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The area of a trapezoid:
trapezoid To find the area of a trapezoid...  The longer base (the bottom) is big B and the smaller base (the top) is little b...

Go here to see where this formula comes from!

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How to find the area of strangely shaped objects:

Let's find the area of this thing...  We, basically, need to find the area of each color and add them all up.  And we'll just have to find those areas one by one!

geometric shape

Here are all the missing pieces:

geometric shape

Now, add them all up!

+ 4 + 32 + 6.28 = 48.28