Area of a Triangle and Trapezoid

Presentation

•

Mathematics

•

7th Grade

•

Easy

Joseph Anderson

Used 1+ times

FREE Resource

8 Slides • 10 Questions

Area of a triangle and trapezoid

write down the formulas

Notice anything about the triangles?

Triangles are just rectangles cut in half

Area of a triangle

* multiply the base x height and then divide by 2

Triangle Example

$A\ =\ \frac{6\ \times\ 18}{2}$

$A\ =\ \frac{108}{2}=\ 54$

Multiple Choice

What is the area?

12 cm²

14 cm²

24 cm²

Find the missing side

1. take the area and multiply it by 2

2. divide by the other side

Solve for x

The area is 42cm2
- multiply the area by 2 (42 x 2 = 84)
- divide by the base (84 $\div$ 12 = 7)

The height of the triangle is 7cm

Multiple Choice

To find the area of a triangle, simply multiply the base and the height.

True

False

Area of a trapezoid

A = $\frac{b_1+b_2}{2}h$

Trapezoid Example

$A=\frac{3+8}{2}\ 5$

$A=\ \frac{11}{2}\ 5$

A\ =\ 5.5\ x\ 5\ =\ 27.5ft^2

Multiple Choice

Find the area of the trapezoid.

18 m²

165 m²

84 m²

22.5 m²

Multiple Choice

Find the area.

42 yd²

84 yd²

19 yd²

5 yd²

Multiple Choice

What is the area of the trapezoid?

24 units²

30 units²

28 units²

20 units2

Multiple Choice

41 yds²

45 yds²

44 yds²

43 yds²

Multiple Choice

What does area mean?

the distance around a shape

half the distance around a shape

the amount of space outside a shape

the amount of space inside a shape

Multiple Choice

Area?

108 cm sq

60 cm

432 cm sq

216 cm sq

Multiple Choice

Find the area of a triangle with a height of 4 mm and a base of 6 mm?

5 mm squared

6 mm squared

12 mm squared

24 mm squared

Multiple Choice

Area or triangle?

20 cm²

56 cm²

28 cm²

27 cm²

Area of a triangle and trapezoid

write down the formulas

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