Geometry: Angles in Triangles

If one angle in a triangle is 90 degrees, what type of triangle is it?

• Acute triangle

• Obtuse triangle

• Right triangle

• Scalene triangle

What is the formula to find the third angle in a triangle?

• Third angle = 180 - (angle1 + angle2)

• Third angle = angle1 + angle2

• Third angle = 90 - (angle1 + angle2)

• Third angle = 360 - (angle1 + angle2)

Find the missing angle if two angles in a triangle are 55 degrees and 70 degrees.

• 55 degrees

• 45 degrees

• 60 degrees

• 50 degrees

Which triangle congruence test is NOT valid? (SAA, SSS, SSA, SAS)

• SAA

• SSS

• SSA

• SAS

What is the name of a triangle with two sides of equal length?

• Equilateral triangle

• Scalene triangle

• Isosceles triangle

• Right triangle

What is the name of a triangle with all angles less than 90 degrees?

• Acute triangle

• Obtuse triangle

• Right triangle

• Scalene triangle

What is the relationship between the angles in a triangle?

• The sum of the angles is always 180 degrees.

• The sum of the angles is always 90 degrees.

• The angles can be any value as long as they are positive.

• The sum of the angles is always 360 degrees.

What is the sum of the interior angles in a triangle?

• 90 degrees

• 180 degrees

• 360 degrees

• 120 degrees

What is the name of a triangle with all sides of different lengths?

• Equilateral triangle

• Isosceles triangle

• Scalene triangle

• Right triangle

What is the name of a triangle with one right angle?

• Acute triangle

• Obtuse triangle

• Right triangle

• Scalene triangle