Calculating Angles at a Point and on a Straight Li...
Preview only Sign up to use worksheet Signup now
  • Introduction
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Angles at a point add to 360°.

Angles on a straight line add to 180°.

 

If we know one of the angles at a point, or on a straight line,  we can calculate the other one.

 

Examples

 

At a point:


a + 240° = 360°
a = 120°
On a straight line:


b + 160° = 180°
b = 20°
At a point:


a + 45° = 360°
a = 315°


 

  • Question 1
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angle.

 

a = 120

a = 120°

a = 60°

  • Question 2
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angle.

 

a = 220°

a = 120°

a = 315°

  • Question 3
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angle.

 

b = 40°

b = 20°

b = 15°

  • Question 4
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angles, c and d.

 

 cd
120°
90°
100°
  • Question 5
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angle.

 

a = 140°

a = 110°

a = 115°

  • Question 6
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angle.

 

a = 325°

a = 210°

a = 245°

  • Question 7
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angle

.

a = 85°

a = 90°

a = 45°

  • Question 8
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angle.

 

 

b = 55°

b = 55

b = 45°

  • Question 9
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angle.

 

 

b = 55°

b = 180°

b = 25°

  • Question 10
PREVIEW ONLY. SIGN UP TO USE WORKSHEET.

Calculate the unknown angles, c and d.

 

 cd
140°
60°
40°
Progress