Find Measures of Sides of Triangles to Classify

What is a possible third side to a triangle with side lengths of 13 and 4?

• 9

• 12

• 8

• 5

Which set of numbers may represent the lengths of the sides of a triangle?

• {2,5,9}

•  {6,6,7}

• {6,4,2}           

• {7,8,1}

Classify by sides and angles.

• A

• B

• C

• D

Classify by sides and angles.

• A

• B

• C

• D

• equilateral
• isosceles
• scalene

• obtuse scalene
• right isosceles
• scalene acute
• acute isosceles

Find x

• 9

• 2

• 6

• 4

Which would be the best classification for the triangle shown?

• acute isosceles

• right scalene

• acute scalene

• obtuse scalene

Find the measures of the sides of △ABC with vertices A(1, 5), B(3, –2), and C(–3, 0). Classify the triangle by its sides.

• Equilateral

• Isosceles

• Scalene

• Right

If △ABC is an isosceles triangle, ∠B is the vertex angle, AB = 6x + 3, BC = 8x – 1, and AC = 10x – 10, find the value of x and the length of AC.

• x = 3.25; AC = 22.5

• x = 2; AC = 10

• x = 3; AC = 20

• x = 2; AC = 15