Finding the Unknown Angles

In the following figure, triangle LMO is an equilateral triangle and triangle MNO is an isosceles triangle. Find ∠MNO.

• 120 degrees

• 90 degrees

• 60 degrees

• 30 degrees

In the following figure, triangle PQT is an equilateral triangle. Triangle PRS is an isosceles triangle. ∠QPR = ∠RPS = ∠SPT. Find ∠PRS.

• 45 degrees

• 20 degrees

• 80 degrees

• 120 degrees

Triangle ADB is an equilateral triangle. ∠BCD= 54 degrees and AB is perpendicular to BC. Find ∠ADC.

• 132 degrees

• 156 degrees

• 54 degrees

• 96 degrees

Triangle BCD and triangle ABD are isosceles triangles. Find ∠BAD.

• 54 degrees

• 96 degrees

• 36 degrees

• 27 degrees

Triangle ABC IS A right triangle. Find ∠ABC.

• 39 degrees

• 51 degrees

• 21 degrees

• 47 degrees

Triangle DEF is an isosceles triangle. Find ∠EFD.

• 72 degrees

• 28 degrees

• 36 degrees

• 64 degrees

Triangle KLN is an equilateral triangle. Find ∠MKN.

• 35 degrees

• 75 degrees

• 85 degrees

• 45 degrees

What is the sum of all angles inside a triangle?

• 120 degrees

• 180 degrees

• 90 degrees

• 360 degrees

What is the measure of an angle in an equilateral triangle?

• 60 degrees

• 30 degrees

• 45 degrees

• 90 degrees

What type of triangle (based on side) has two equal sides?

• Equilateral triangle

• Scalene triangle

• Obtuse triangle

• Isosceles triangle