Review of 2 Dimensional Figures

Presentation

•

Mathematics

•

7th Grade

•

Medium

•

CCSS

7.G.B.4, 6.G.A.1, 3.MD.C.7D

Standards-aligned

Ashley Ishee

Used 15+ times

FREE Resource

9 Slides • 14 Questions

Review OF 2 Dimensional FigureS

Radius- the distance from the center of a circle to the outside edge.

Diameter- a straight line that passes through the center of a circle.

Circumference- the distance around a circle

Parts of a Circle

We use the value of 3.14 as the approximate value of PI.

π = 3.14

We use pi to help us find the circumference and area of a circle.

Circumference of a circle

there are two formulas to find the circumference of a circle

Multiple Choice

The distance from the center of the circle to any point on the circle is called the...

radius

diameter

circumference

area

Multiple Choice

The distance across the circle through the center is called the...

radius

diameter

circumference

area

Multiple Choice

Find the Circumference (round to nearest tenth):
diameter = 12 in.

37.7 in.

37 in.

38 in.

75.4 in.

Multiple Choice

Find the Circumference (round to nearest tenth):
radius = 8 m

50.5 m

50 m

25.1 m

50.2 m

Multiple Choice

Daniel wants to buy cookies for her friend. The radius of a cookie is 5 inches. What is the cookie’s circumference?

10 in

2.5 in

15.7 in

31.4 in

Area of a circle

Formula

Multiple Choice

Shring's dining room table is round and has a radius of 4.5 feet. What is the tabletop's area?

63.585 ft²

68.345 ft²

64.585 ft²

61.345 ft²

Multiple Choice

Marisa purchases a pot for her father's garden. The diameter of the bottom of the pot is 18 cm. What is the area of the pot's bottom? (Round to the nearest whole number.)

28 cm²

57 cm²

254 cm²

1017 cm²

Area of composite figures

A composite figure is a figure made up of two or more shapes.

To find the area of a composite figure, you break it into shapes that you do know the area of.

*subtract inside area from outside area

Area of the shaded region

*add areas

Total Area

Two different composite figures

Multiple Choice

What is the area of this composite shape?

14 in²

68 in²

36 in²

24 in²

Multiple Choice

What is the area of the shaded region?

20 sq cm

4 sq cm

30 sq cm

24 sq cm

Multiple Choice

What is the area of the composite figure?

48 cm²

90 cm²

78 cm²

12 cm²

Multiple Choice

Find the area of the composite figure.

100 m squared

131.4 m squared

139.25 m squared

178.5 m squared

Multiple Choice

Find the area of the shaded region:

350 cm²

137.5 cm²

212.5 cm²

484.2 cm²

Multiple Choice

The rectangular pool measures 22 feet by 12 feet and has a hot tub in the middle of it. The bottom of the pool needs to be covered in tiles.

What is the area that needs to be covered in tiles?

264 ft²

113.04 ft²

150.96 ft²

377.04 ft²

Multiple Choice

A neighborhood playground is replacing its wooden fencing. The fence must go around the entire playground, as well as around the sandbox. How many feet of fencing will this require?

340 ft.

170 ft.

4050 ft.

3150 ft.

Test tomorrow! Please study!!!

Bring your notes to school tomorrow!!

Do not forget to complete your delta math!!!!

Review OF 2 Dimensional FigureS

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