Sides of a Triangle

Which of these sets of angles will make a triangle?

• 19 $\degree$ , 28 $\degree$ , 37 $\degree$

• 91 $\degree$ , 82 $\degree$ , 73 $\degree$

• 70 $\degree$ , 65 $\degree$ , 45 $\degree$

Complete the Theorem: "The sum of the measures of the two smallest sides of a triangle...

• ...will equal the measure of the third side.

• ...cannot be more than the measure of the third side.

• ...must be greater than the measure of the third side.

• ...has nothing to do with the third side.

Complete the Theorem: "The sum of the angles of any triangle..."

• ...is equal to the measure of the third side.

Classify by its angle measures.

• equiangular

• equilateral

• isosceles

• acute

Which of these sets of angles is NOT a triangle?

• 53 $\degree$ , 61 $\degree$ , 66 $\degree$

• 28 $\degree$ , 66 $\degree$ , 86 $\degree$

• 33 $\degree$ , 66 $\degree$ , 88 $\degree$

Can a triangle be formed with side lengths:
17, 9, 30

• yes

• no

• not enough information

In order to make a triangle-the sum of the lengths of the two shortest sides of a triangle is _____ than the third side.

• less

• greater

• equal

Mrs. Barto has a pet rabbit and wants to build a pen for it. She has 3 pieces of lumber: 3ft, 7ft, and 8ft. Can she build a closed triangular pen with these three boards? (Will these three sides make a triangle?)

• Yes

• No

Isosceles Triangle Equilateral Triangle Right Triangle Scalene Triangle

• Isosceles Triangle

• Equilateral Triangle

• Right Triangle

• Scalene Triangle

No sides are the same length

• Equilateral Triangle

• Isosceles Triangle

• Scalene Triangle

• Right Triangle