Area of Irregular Shapes

1) box the shape & use subtraction 2) break up the shape & use addition

2 methods to find the area of an irregular shape

irregular shape

a polygon that does not have all sides and angles equal

the number of square units that covers a closed shape

area

A= L x W

area formula of a rectangle

A=1/2 bh or A=bh/2

area formula of a triangle

find the area of the entire figure

finding the area of irregular shapes using subtraction, you first __________________________

258.5 square cm

if a triangle has a base of 17 cm and a height of 31 cm. What is the area?

add all the areas to find the total

using the addition method to find the area of an irregular shape the last thing you do is ______________________________________

12 ft squared

what is the area of the missing shape

84 ft squared

what is the area of this figure