Area of Triangles

1
Area of Triangles
2
Look at the following parallelogram.
13 cm
12 cm
What is the area?
A bh
15 cm
A 15 cm X 12 cm
A 180 cm2
3
Look at the same parallelogram.
What happens when you divide the parallelogram in
half diagonally?
How does the area of one of the triangles compare
to the area of the parallelogram?
4
The area of the triangle equals half of the area
of the parallelogram.
What would the formula for the area of a triangle
be?
A
A
or
bh
5
What is the area of the triangle outlined in red?
A
15 X 12
13 cm
A
12 cm
2
180
A
15 cm
2
A
90 cm2
6
Find the area of the following triangle.
A
25 X 30
A
2
30 ft
750
A
2
25 ft
A
375 ft2
7
Find the area of the following triangle.
A
3 X 5
A
2
7 in
15
5 in
A
2
A
7.5 in2
3 in
8
Find the area of the triangle.
A








6 X 3
A
2
3 units
18
A
2
A
6 units
9 units2
9
Find the area of the triangle.








A
6 X 6
A
7 units
2
36
6 units
A
2
A
18 units2
6 units
10
Find the area of the triangle.
A








4 X 5
A
2
20
A
2
A
10 units2