Finding the perimeter and area of triangles is fairly simple. Here’s all you need to remember:

1. Perimeter is always = the Path around an object. In a triangle, just add up the lengths of all three sides.
2. The formula for the area of a triangle is A = ½ b • h, where b is the base and h is the height.

EXAMPLE: Find the perimeter and area of the triangle below.

PERIMETER:
Perimeter is always the path around the object.
All you need to do is add the lengths of the 3 sides (lengths are in black text).

P = 22 cm + 15 cm + 26 cm
P = 63 cm

AREA:
Area is the space inside the triangle. To find the area of any triangle you multiply the base times the height and divide it by 2.
REMEMBER: The base and the height are always perpendicular to one another. 

For the triangle above, the base (b) is 26 cm and the height (h) is 10 cm.

A = ½ b • h
A = ½(26 cm)(10 cm)
A = (13 cm)(10 cm)
A = 130 cm²