# Reading angles on a protractor Part 3

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## Lesson details

### Key learning points

1. In this lesson, we will learn how to use a protractor to calculate and measure a reflex angle and an angle in a shape.

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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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## Worksheet

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## Starter quiz

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### 4 Questions

Q1.
What error has the user made?
Baseline not aligned
Correct answer: Both the cross hairs and baseline are not aligned
Cross hairs not aligned
None - the angle is correct, 20°
Q2.
How big is angle C?
100°
140°
60°
Q3.
How big is angle B?
100°
140°
40°
Q4.
What is the approximate size of an internal angle of this regular pentagon?
112°
38°
72°
it's impossible to tell

## Exit quiz

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### 4 Questions

Q1.
What is the size of this reflex angle?
140°
40°
Q2.
Which angle is this protractor measuring?
a
c
d
e
Q3.
How many degrees is this angle?
150°
30°
Q4.
How many degrees is this angle?
120°
140°
40°
60°