2D Figures Study Guide

Find the value of x. Round to the nearest tenth, if necessary.

Triangle with sides 16 cm, x cm, and 30 cm. x = _______

• x = 14 cm

• x = 6.8 cm

• x = 25.4 cm

• x = 34 cm

Find the value of x. Round to the nearest tenth, if necessary.

Triangle with sides 7 ft, x ft, and 17 ft. x = _______

• x = 15.5 ft

• x = 18.4 ft

• x = 5 ft

• x = 20 ft

Find the value of x. Round to the nearest tenth, if necessary.

Triangle with sides 16 in., 13 in., and x in. x = _______

• x = 10 in.

• x = 9.2 in.

• x = 9.3 in.

• x = 20.6 in.

Find the value of x. Round to the nearest tenth, if necessary.

Triangle with sides 23 m, 20 m, and x m.

x = _____ m.

Find the value of x. Round to the nearest tenth, if necessary.

Triangle with sides 9 ft, 9 ft, and x ft.

x = ____ ft.

Find the value of x. Round to the nearest tenth, if necessary.

Triangle with sides 35 in., 37 in., and x in.

x = ____ in.

• x = 12 in.

• x = 50.9 in.

• x = 15.2 in.

• x = 10 in.

Kylie's computer screen measures 21.4 inches long by 12.7 inches high. To the nearest inch, what is the length of the diagonal of her computer screen?

• 18 inches

• 24 inches

• 25 inches

• 26 inches

Tell whether the triangle with the given side lengths is a right triangle.

Sides: 8, 24, 25

• Yes, it is a right triangle!

• No, it is not a right triangle.

Tell whether the triangle with the given side lengths is a right triangle.

Sides: 20, 21, 29

• Yes, it is a right triangle!

• No, it is not a right triangle.

Tell whether the triangle with the given side lengths is a right triangle.

Sides: 12, 35, 38

• Yes, it is a right triangle!

• No, it is not a right triangle.