Year 8
Polygons and triangles
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Lesson details
Key learning points
- In this lesson, we will learn that the sum of the interior angles of a polygon can be found using triangles.
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.
ABCD forms a quadrilateral. What are the total interior angles of the quadrilateral?
180 degrees
36 degrees
90 degrees
Q2.
Angle ABC is 98 degrees. What would the size of the reflex angle formed be on the exterior?
2 degrees
360 degrees
82 degrees
Q3.
If I combined two equilateral triangles together with a shared side, what would the shape formed be called?
Equilateral triangle
Rectangle
Square
Q4.
Which of the following is not a rule used so far for angles?
Angles on a straight line sum to 180 degrees
Interior angles in a triangle sum to 180 degrees
Q5.
If A + B + C = 180, D + E = 180 and F is a right angle, what does A + B + C + D + E + F equal?
180 degrees
360 degrees
540 degrees
5 Questions
Q1.
The total sum of the interior angles of two triangles would be equal to...
180 degrees
540 degrees
90 degrees
Q2.
If I have a regular pentagon, how many triangles from one distinct point internally can I create?
1
4
5
Q3.
If I have a regular pentagon, what would the total interior angles sum to?
180 degrees
360 degrees
450 degrees
Q4.
If I have a regular octagon, how many triangles from one distinct point internally can I create?
4
5
8
Q5.
If I have a regular octagon, what would the total interior angles sum to?
1440 degrees
360 degrees
900 degrees