Triangle Sum & Triangle (side) Inequality

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

How many triangles exist with the following angle measures?
80°, 50°, 50°

• No triangle exists with the given angle measures.
• More than one unique triangle exists with the given angle measures.
• Exactly one unique triangle exists with the given angle measures.

Find the measure of the missing angle.

• 26º

• 36º

• 85º

• 144º

If 2 of the angles of a triangle are 30 and 70 degrees, the third angle measures...

• 80
• 100
• 60
• 90

In a Right Triangle, the sum of the two angles that are NOT right must be ________.

• 60 degrees

• 90 degrees

• 180 degrees

• some other measure

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

Could a triangle with these side lengths exist?

15, 12, 9

• Yes

• No

Could a triangle with these side lengths exist?

20, 10, 9

• Yes

• No

The smallest angle would be located where in a triangle?

• Across from the shortest side.

• Across from the longest side.