All About Triangles

Find the missing angles.

• x=50^o, y=63^o, z=32^o

• x=50^o, y=63^o, z=63^o

• x=67^o, y=63^o, z=42^o

• x=67^o, y=63^o, z=32^o

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

What is the " Triangle Inequality Theorem"?

• 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

When classifying a triangle by its sides, what type of triangle has two equal sides?

• equilateral triangle

• isosceles triangle

• scalene triangle

• none of the above

Triangle DEF has a missing angle measure. If the m∠E is 93 degrees and the m∠F is 24 degrees. What is the measure of angle D?

• 63 degrees

• 36 degrees

• 90 degrees

• 76 degrees

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