Maths Dictionary · JSS 2
Triangle
Simple meaning
A polygon with three sides. Its angles add up to 180°.
Example
A triangle with angles 50°, 60° and 70°.
See it
From the Angles in a Triangle lesson. Try moving things around.
60° + 48° + 72° = 180°
This is an acute-angled, scalene triangle. Drag any corner!
Put the three angles together and they make a straight line: 180°.