5th
Grade
Acute Triangle: Find the missing base
Use the clues provided to find the base of each triangle. Show your work.
Review:
Triangle Area =
1
2
x base x height
The base of a triangle can be any one of its sides.
The height is the distance from a base to its opposite point,
or vertex.
A base must be perpendicular to its height.
height (H)
base (B)
Acute Triangle
is a triangle that
has three acute angles
(angles that measure
between 0 and 90 degrees).
32
Area = ________
sq.ft.
8
Height = _________ft.
Area = 32
Example:
8
B
1
1 x base x height
Area = __
2
32 = 1 x base x 8
2
8
Therefore, base = 32 x 2 = ______
ft.
8
2
Area = 42
7
B
B
Area = ________ sq.ft.
Height = _________ft.
Area = 1 x base x height
2
Therefore, base =
Area = ________ sq.ft.
Height = _________ft.
Area = 1 x base x height
2
= ______ ft.
3
Therefore, base =
4
Area = 27
Area = 56
Area = 80
8
= ______ ft.
B
6
14
B
Area = ________ sq.ft.
Height = _________ft.
Area = 1 x base x height
2
Therefore, base =
Area = ________ sq.ft.
Height = _________ft.
Area = 1 x base x height
2
= ______ ft.
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Therefore, base =
= ______ ft.
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