10.2 Area of a Triangle
Objective: Find the area of a
triangle.
Mr. Williams GESD jwilliams@gesd40.org
Image: 'Orange geometry or 3 triangles'
www.flickr.com/photos/57949897@N00/414859701
1

Base of a triangle ­
the length of any one of the
triangles sides.
Image: 'Staten Island Memorial'
www.flickr.com/photos/91273409@N00/2158538468
2

Height of a Triangle ­
perpendicular distance
between the side whose
length is the base and vertex
opposite that side.
Image: 'neon bordered triangle'
www.flickr.com/photos/37996577120@N01/161974259
3

bh
Area = 2
Height
Height
Base
Base
Image: 'Geodesic Afternoon'
www.flickr.com/photos/36543076@N00/196759239
4

bh
Area = 2
10 m
20 m
Image: 'Geodesic Afternoon'
www.flickr.com/photos/36543076@N00/196759239
5

bh
Area = 2
10 ft
20 ft
Image: 'Geodesic Afternoon'
www.flickr.com/photos/36543076@N00/196759239
6

Find the area of the red figure.
3 m
8 m
10 m
Image: 'Geodesic Afternoon'
www.flickr.com/photos/36543076@N00/196759239
7