The figure above has two regular shapes. It has a square and half a circle

Find the area for each of those two shapes and add the results

Area of the square = s

Area of the square = 4

Area of the square = 16

Area of the circle = pi × r

Notice that the radius of the circle is 4/2 = 2

Area of the circle = 3.14 × 2

Area of the circle = 3.14 × 4

Area of the circle = 12.56

Since you only have half a circle, you have to multiply the result by 1/2

Area of the half circle = 1/2 × 12.56 = 6.28

Area of this shape = 16 + 6.28 = 22.28

The figure above has three regular shapes. Starting from top to bottom, it has a triangle, a rectangle, and a trapezoid

Find the area for each of those three shapes and add the results

Area of the triangle = (base × height)/2

Area of the triangle = (3 × 4)/2

Area of the triangle = 12/2

Area of the triangle = 6

Area of the rectangle = length × width

Area of the rectangle = 3 × 10

Area of the rectangle = 30

Area of the trapezoid = ((b

Area of the trapezoid = ((3 + 5) × 2)/2

Area of the trapezoid = (8) × 2/2

Area of the trapezoid = 16/2

Area of the trapezoid = 8

Area of this shape = 6 + 30 + 8 = 44

The area of irregular shapes can be as challenging as this last example, so study it carefully!

The figure above has 4 regular shapes. It has a triangle, two rectangles, and half a circle

Find the area for each of those 4 shapes and add the results

Area of the rectangle = length × width

Area of the rectangle = (12 × 16)

Area of the rectangle = 192

Since we have two of the same rectangle, the area is 192 + 192 = 384

Notice that the longest side of the rectangle is the base of the triangle and the short side of the rectangle is the height of the triangle

So,

Area of the triangle = (base × height)/2

Area of the triangle = (16 × 12)/2

Area of the triangle = (192)/2

Area of the triangle = 96

To get the area of the half circle, we need to know the diameter

Notice that the diameter is the hypotenuse of a right triangle, so use the Pythagorean Theorem to find the length of the diameter

c

c

c

c

c = √400

c = 20

Therefore, the diameter is 20. Since the diameter is 20, the radius is 10

Area of the circle = pi × r

Area of the circle = 3.14 × 10

Area of the circle = 3.14 × 100

Area of the circle = 314

Since you only have half a circle, you have to multiply the result by 1/2

1/2 × 314 = 157

Area of this shape = 384 + 96 + 157 = 637

Here we go! I hope these good examples were very helpful in helping you how to get the area of irregular shapes.

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