All About Triangles

In a triangle, the sum of all angles must be ____________.

• 100º

• 180º

• 90º

• 360º

Find the measure of the missing angle.

• 95º

• 85º

• 35º

• 45º

Find the measure of the missing angle.

• 26º

• 36º

• 85º

• 144º

Does a triangle with these side lengths exist?

15, 12, 9

• Yes

• No

Does a triangle with these side lengths exist?

20, 10, 9

• Yes

• No

What is the " Triangle Inequality Theorem"?

(how do you determine if you can make a triangle)

• The sum of 2 sides is > the 3rd side

• The lengths of a triangle's sides are all the same

• The sum of 2 angles is < the 3rd angle

• I have no idea

Which of the following does not represent the lengths of the sides of a triangle?

• 2 cm, 6 cm, 7 cm

• 5 cm, 2 cm, 5 cm

• 5 cm, 5 cm, 8 cm

• 3 cm, 10 cm, 15 cm

Angles that are exactly 90 degrees are called _____ ______.

• for real angles

• acute angles

• obtuse angles

• right angles

If two sides of a triangle measure 4 and 8, the third side could be: ______________.

• 9

• 3

• 4

• 1

The longest side of a triangle would be located where on a triangle?

• Across from the smallest angle

• Across from the largest angle