Triangle
Definition

A triangle is a polygon with three sides and three angles.

Triangle
More Information

Indicator marks for sides and angles in a triangle diagram.

Relationship between sides and angles.

Demonstration
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Perimeter of a Triangle
Perimeter of a Triangle
Area of a Triangle

b: The length of a base (side) of a triangle

a: The length of the altitude of the triangle (corresponding to the chosen base)

A: The area of the interior of the triangle (Explanation of formula).

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