Chapter 9 Review (7th)

Circles and Circumference

100

What is the diameter of a circle with a radius of 8in. 

16in.

200

What is the radius of a circle with a diameter of 56cm?

28cm.

300

Find the circumference of a circle with a diameter of 8in. (Use 3.14 for pi)

C=(pi)(d) 

C=(3.14)(8)

C= 25.12 in. 

400

Find the circumference of a circle with a radius of 2m. (use 22/7 for pi)

C=2(pi)(r)

C=2(22/7)(2)

C= (22/7)(4)

C= 88/7m OR 12.57m 

500

What is the radius of a circle with a circumference of 122 cm. 

C=2(pi)(r)

122=2(3.14)(r)

122=6.28(r)

19.43 cm=r

Area of Circles

100

Find the area of a circle with a radius of 9in. 

A=(pi)(r)²

A=(3.14)(9)²

A=(3.14)(81)

A=254.34in²

200

Find the area of a circle with a diameter of 1.5ft. 

A=(pi)(r)²

A=(3.14)(0.75)²

A=(3.14)(0.5625)

A=1.77ft²

300

DOUBLE JEOPARDY

Colton

400

Find the area of a semicircle with a diameter of 30in. 

A=(pi)(r)²/2

A=(3.14)(15)²/2

A=(3.14)(225)/2

A=706.5/2

A=353.25in²

500

Which is one has a bigger radius?

A circle with a circumference of 50in or a semicircle with a circumference of 75in? 

C=2(pi)(r)

50=2(3.14)(r)

r=7.96in 

C=2(pi)(r)/2

75=2(3.14)(r)/2

150=6.28(r)

r=23.88in

Circle with a circumference of 75in!!

Composite Figures

100

Find the perimeter of the following shape. 

29.7ft

200

Find the area of the following shape. 

64.26 ft²

300

Find the area and perimeter of the following shape.

Perimeter: 29cm
Area: 49.5cm²

400

Find the area and perimeter of the following shape. 

Perimeter: 55.1ft

Area: 236.625ft²

500

Is your friend correct? Why or why not. 

No, they added the 5 twice. 

Constructing Polygons

100

Can you draw a triangle with the angle measurements of 45, 45, 90? 

The angles of a triangle need to equal 180.

45+45+90=180

Yes!

200

Can you draw a triangle with the angle measurements 60, 60, 80?

The angles of a triangle need to equal 180.

60+60+80=200

NO!

300

Can you draw a quadrilateral with the angle measurements 100, 90, 65, 105?

The angles need to equal 360 

100+90+65+105=360

Yes

400

Use a protractor to draw a triangle with the angle measurements of 90, 55, and 35. 

90+55+35=180

Triangle is possible. 

Look at triangles. 

500

Use a protractor to draw a quadrilateral with angle measurements of 45, 50, 130 135

45+50+130+135=360

Quadrilateral is possible. 

Unknown Angles

100

What is the unknown angle of a triangle with angle measurements of 155, 10, ?

? = 15

180-155-10=15

200

Find the unknown angle measurement of a triangle with angle measurements 100, 45, ?

? = 35

180-100-45=35

300

Find the unknown angle measurement of the quadrilateral with angle measurements of 160, 30, 20, ?

? = 150

400

Find the unknown angle measurement of a quadrilateral with angle measurements of 120, 120, ?, ?

?=60

?=60 

360-120-120=120

120/2=60 

500

DOUBLE JEOPARDY!!!!

Miles Teller