Triangles: Angles and Side Lengths Quiz

A triangle has three sides with lengths 3 cm, 4 cm, and 5 cm. Which of the following correctly identifies all three side lengths?

• 3 cm, 4 cm, and 6 cm

• 3 cm, 4 cm, and 5 cm

• 2 cm, 4 cm, and 5 cm

• 3 cm, 5 cm, and 7 cm

What is the sum of all interior angles in any triangle?

What is the mean of the following set of numbers: 4, 6, 8, 10, 12?

• 6

• 10

• 8

• 9

What is the mean of the side lengths 5 cm, 7 cm, and 9 cm of a triangle?

• 6 cm

• 8 cm

• 7 cm

• 9 cm

Which of the following sets of side lengths can form a valid triangle? (Hint: The sum of any two sides must be greater than the third side.)

• 1 cm, 2 cm, and 10 cm

• 3 cm, 4 cm, and 5 cm

• 2 cm, 3 cm, and 8 cm

• 1 cm, 1 cm, and 5 cm

What is the mean of the following test scores: 70, 80, 90, 100?

• 80

• 85

• 90

• 75