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# How Big Is My Triangle? - PowerPoint PPT Presentation

How Big Is My Triangle?. Calculating the Area of a Triangle. 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. 1 st triangle. 2 nd triangle.

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### How Big Is My Triangle?

Calculating the Area of a Triangle

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

Height (h) = 4 in

Base × Height (b × h) = Area

6 × 4 = 24 square inches

Base (b) = 6 in

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 2

b × h × 2

So, how do you find the base and height of a triangle? you find the area 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

height

base

height

base

What is the area of the triangle below? you find the area of a triangle?

Use the formula (b × h) ÷ 2

15 square inches

10 square inches

7½ square inches

5 in

3 in

Is the area of this triangle 8 square inches? you find the area of a triangle?

4 inches

4 inches

If this triangle has the specified base and height of this triangle.height, what is its area?

21 square inches

42 square inches

13½ squareinches

6 in

7 in

If this triangle has the specified base and height of this height, what is its area?

4½ square inches

18 square inches

9 square inches

9 in

2 in