Triangles
Circles
Definitions & Formulas
100

What is the total perimeter of a triangle whose sides measure 6, 8, and 10 inches?

24 in

100

What is the area of a circle with a radius of 12 inches?

144 (pi) inches2

-OR-

452.16 inches2

100

FILL IN THE BLANK: 

Perimeter is defined as the space "__________" a figure.

Around

200

What is the area of a triangle when its base measures 6 ft and its height is 12ft? 

36ft2

200

What is the area of a circle with a diameter of 10 feet?

25 (Pi) feet2

-OR-

78.5 feet2

200

FILL IN THE BLANK: 

Area is defined as the space "__________" a figure.

Inside

300

What is the total perimeter of a triangle whose sides measure 7.5, 8, and 16.5 kilometers?

32 km

300

What is the circumference of a circle with a radius of 17 inches?

106.76 inches

300

FILL IN THE BLANK: 

Circumference is also known as the "__________" of a circle.

Perimeter

400

What is the total area of a triangle whose base measures 9 yards and has a height of 10 yards? 

45 yards2

400

What is the circumference of a circle with a diameter of 9 yards?

28.26 yards

400

Write the correct equation for the following situation: 

Area of a triangle

A= 1/2 (bxh)

500

Create a triangle that has the following: 

Perimeter of 12 

AND

Area of 20

*Answers may vary*

500

Draw a circle with a diameter of 18 kilometers. Then provide the following: 

- Radius

- Area

- Circumference

Radius: 9 kilometers

Area: 81 pi km2 / 254.34 km2

Circumference: 56.52 km

500

Write the correct equation for the following situation: 

Area of a circle

A = Pi(r2

or 

A = 3.14(r2)

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