Interior angles of polygons
Key Notes:
The measures of the angles of a triangle add up to 180°.
Learn with an example
What is the sum of the angle measures in this shape?
—————.
The angle measures of a triangle add up to 180°.
What is the sum of the angle measures in this shape?
———-.
Find out how many triangles make up a quadrilateral.
A quadrilateral is made up of 2 triangles, which each have 180°. Multiply.
2 × 180° = 360°
The angle measures of a quadrilateral add up to 360°.
What is the sum of the angle measures in this shape?
———.
Find out how many triangles make up a pentagon.
A pentagon is made up of 3 triangles, which each have 180°. Multiply.
3 × 180° = 540°
The angle measures of a pentagon add up to 540°.
let’s practice!
