Year 11
Core
Year 11
Core
Finding the sum of interior angles in a polygon
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Lesson details
Key learning points
- In this lesson, we will calculate the sum of interior angles in polygons, and apply this to find missing angles.
Licence
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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5 Questions
Q1.
What is the sum of exterior angles of any polygon?
180º
540º
Different with each polygon
Q2.
Calculate the size of angle a.
15º
67º
73º
Q3.
Calculate the size of angle b.
134º
48º
98º
Q4.
4. What is the size of each exterior angle of a regular 15 sided polygon?
42º
48º
72º
Q5.
5. A regular polygon has an exterior angle of 30º. How many sides does it have?
10
14
16
4 Questions
Q1.
What is the sum of interior angles of a 20-sided shape?
1800º
2880º
3600º
Q2.
What is the sum of interior angles of a 9-sided shape?
1620º
1980º
900º
Q3.
What is the missing angle, labelled x?
114º
33º
Q4.
What is the size of each interior angle in a regular octagon?
225º
45º
90º