Year 8
Finding missing angles in polygons
Switch to our new maths teaching resources
Slide decks, worksheets, quizzes and lesson planning guidance designed for your classroom.
Play new resources video
Lesson details
Key learning points
- In this lesson, we will learn how to find an unknown angle in a polygon.
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.
Loading...
5 Questions
Q1.
If I split a 7 sided shape into 5 triangles, I have done the correct process to find the total interior angles within the shape.
False
Q2.
Which of the following WOULD give you the total interior angles within a n-sided polygon?
180n
360n
360n - 180
Q3.
Which of the following WOULD NOT give you the total interior angles of a n-sided polygon?
180(n - 2)
180n - 360
Q4.
The sum of the total interior angles in a 30 sided shape is...
504 degrees
540 degrees
5400 degrees
Q5.
What would be the correct calculation to work out the total sum of the interior angles in a decagon?
180(10)
360(10-2)
360(8)
5 Questions
Q1.
A triangle is made up of the following: 73 degrees, 51 degrees and x degrees. Solve for x.
180 degrees
236 degrees
65 degrees
Q2.
If a quadrilateral contains 3 right angles, what must the final angle be to form a quadrilateral?
A reflex angle
An acute angle
An obtuse angle
Q3.
If the angles in a decagon are the following: 73 degrees, 293 degrees, 203 degrees, 9 degrees, 29 degrees, 184 degrees, 173 degrees, 93 degrees, 208 degrees, y degrees. Solve for y.
295
75
95
Q4.
Is it possible to have two obtuse angles in a triangle?
Yes
Q5.
You are told that V + W + X + Y + Z = total interior sum of a pentagon. If V = 90 degrees, W = 110 degrees, X = 10 degrees, Y = 300 degrees, what would Z be?
210
3
300