Triangle properties

What is the sum of the angles in any triangle

• It depends on the triangle.

• 180°

• 90°

• 360°

Answer explanation

ALL triangle have an angle sum of 180°

Triangle ABC has m∠A = 30° and m∠B = 50°. What is m∠c?

• 30°

• 50°

• 100°

• Cannot be determined

Answer explanation

A + B + C =180

30 + 50 + C =180

80 + C =180

C=100

• 47

• 57

• 53

• 133

Tags

CCSS.8.G.A.5

• 145
• 55
• 35
• 45

Tags

CCSS.8.G.A.5

Find the measure of each angle indicated.

• 139°

• 66°

• 138°

• 116°

Tags

CCSS.8.G.A.5

Can a triangle have the side lengths of 4, 3, and 2?

• Yes

• No

• Cannot be Determined.

Answer explanation

Add the two short sides 2+3=5, 5 is bigger than 4 so it can be a triangle.

Can a triangle have the side lengths of 10, 3, and 2?

• Yes

• No

• Cannot be Determined.

Answer explanation

Add the two short sides 2+3=5, 5 is not bigger than 10 so it cannot be a triangle.

Can a triangle have the side lengths of 5, 5, and 10?

• Yes

• No

• Cannot be Determined.

Answer explanation

Add the two short sides 5+5=10, 10 is not bigger than 10 so it cannot be a triangle.

Can a triangle have the side lengths of 7, 7, and 7?

• Yes

• No

• Cannot be Determined.

Answer explanation

Add the two short sides 7+7=14, 14 is not bigger than 7 so it cannot be a triangle.

What do we call the side across from the right angle?

• Leg

• a

• Hypotenuse

• Obtuse