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A triangle has 3 sides (or legs) and the sum of its interior angles add up to 180°.
Isosceles triangles have 2 sides that are equal in length. The 2 sides are also opposite 2 equal angles.
An equilateral triangle has all 3 sides of equal length, and all 3 interior angles equal to 60°
The height (or altitude) of a triangle is the distance from a vertex perpendicular to its opposite side.
To find the perimeter of a triangle, add up the lengths of its 3 sides.
The area of a triangle is found with the formula:
½ base × height
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