Math · Age 11 · Geometry
Angle Facts: Finding Missing Angles (Ex. 2)
Use algebraic angle facts on lines and at points to find unknown angles.
Module
Geometry
Age
Age 11
Duration
10 min
Questions
5
What's in this exercise
Answers are hidden — sign up to practise and check your work.
Question 1
Multiple choice
Three angles at a point are 120°, 150°, and x. What is x?
Question 2
Multiple choice
Angles on a straight line: 3x and 57°. What is x?
Question 3
Multiple choice
Two vertically opposite angles are (2x + 10)° and (x + 40)°. What is x?
Question 4
Sequence
Angles on a line: 2x and 40°. 2x + 40 = 180. 2x = 180 − 40 = ____. x = 70°.
Question 5
True or false
Angles on a straight line always add up to 180°.