1. Angles on a straight line Vertically opposite angles

2. Angles on a straight line
Add up to 180°
We say they are supplementary
30° + 150° = 180°
y + 77° = 180°
y = 180° - 77°
y = 103°

3. Finding angles on a straight line
45° + 39° + b° + 24° = 180°
108° + b° = 180°
b = 180° - 108°
b = 72°

4. Vertically opposite angles
Come in pairs
And are equal
The two blue 75° angles are vertically opposite to each other
The two orange 105° angles are vertically opposite to each other
Notice too how 75° + 105° = 180° because these are angles on a straight line

5. Finding vertically opposite angles
x is vertically opposite to the 55° angle
x = 55°
r = 68°

6. Finding vertically opposite angles
Find x and y:
y and 25° are vertically opposite
y = 25°
(because vertically opposite angles are equal)
x + y = 180°
(because angles on a straight line are supplementary)
We’ve already found y= 25°, so:
x + 25° = 180°
x = 155°

7. Question 1: Click the true statement
a = b B
a + b = 90° C
a + b = 180° D
a and b are complementary

8. Wrong Answer!
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9. Question 2: find the value of xB
x = 100° C
x = 180° D
It is not possible to say what x is

10. Wrong Answer!
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11. Question 3: Find the value of xB
x = 95° C
x = 90° D
x = 85°

12. Wrong Answer!
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13. Question 4: Find x A
10O A B
80O C
100O D
180O

14. Wrong Answer!
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15. Question 5: which of the statements below is FALSE
Angles x and 5x are complementary B
Angles x and 5x are supplementary C
x + 5x = 180° D
x = 30°

16. Wrong Answer!
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17. Question 6: Which statement is FALSE?B
x° and 110° are vertically opposite angles A
x° =110° C
x° and 110° are equal D
x° and 110° are supplementary

18. Wrong Answer!
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19. Question 7
The angle vertically opposite to is … A B C D

20. Wrong Answer!
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21. Question 8: which statement is true?
angle 1 = angle 2 B
angle 1 = angle 4 C
angle 1 = angle 3 D
angle 2 = angle 3

22. Wrong Answer!
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23. Question 9 A B C D Select the true statement X = Y
X and Y are vertically opposite C
X = 30° D
Y = 30°

24. Wrong Answer!
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