Measurements Of Polygons And Circles Worksheets - Lance Mangham, 6th Grade Math, Carroll Isd Page 10
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40Activity 10-6: Area of Triangles
Name:
1
bh
Formula for the area of a triangle:
(Half of the formula for a parallelogram.)
=
or
A
bh
2
2
Example:
The height is measured straight up from the base. The height of this triangle is 5 in.
bh
A
=
2
6 5
•
5 in
A
=
2
6 in
2
=
15 in.
A
A Tricky Triangle - Find the area of triangle ABC.
What is the difference between the solid lines and the dashed lines?
A, B, and C are the vertices of the triangle.
A
How do you determine where the base is and where the height is?
8
Can you draw the height of this triangle in another location on the
paper still showing that it is the height?
C
7
B
5
What is the area of triangle ABC?
Find the area of each triangle using the formula above. Show all steps on a separate sheet of paper .
1.
2.
15 mm
7.5 cm
18 cm
32 mm
3.
4.
6
1
m
10 in.
4
2
23 m
12 in.
3
5.
6.
58 in.
4 ft.
72 in.
4 ft.
th
Created by Lance Mangham, 6
grade math, Carroll ISD
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