How Big Is My Triangle?
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How Big Is My Triangle?
Calculating the Area of a Triangle
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A triangle is one-half of a parallelogram.The second triangle has been turned upside down.
When the second triangle is placed adjacent to the first one, the two triangles form a parallelogram.
1st triangle
2nd triangle
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You know how to find the area of a parallelogram.
Base (b) = 6 in
Height (h) = 4 in
Base × Height (b × h) = Area6 × 4 = 24 square inches
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If a triangle is half of a parallelogram, how do you think you find the area of a triangle?
Multiply base by height (b × h)
Multiply base by height and divide by 2(b × h) ÷ 2
Multiply base by height and multiply by 2b × h × 2
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So, how do you find the base and height of a triangle?
A right triangle is easy
This isosceles triangle isn’t too hard
This scalene triangle can be a little more challenging
height
base
base
height
height
base
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What is the area of the triangle below?
Use the formula (b × h) ÷ 215 square inches
10 square inches
7½ square inches3 in
5 in
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Yes
No
Is the area of this triangle 8 square inches?
4 inches
4 inches
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Draw lines to show where you could measure the base and height of this triangle.
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If this triangle has the specified base and height, what is its area?
21 square inches
42 square inches
13½ squareinches
6 in
7 in
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Draw lines to show where you could measure the base and height of this triangle.
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If this triangle has the specified base and height, what is its area?
4½ square inches
18 square inches
9 square inches
9 in2 in