Area and Perimeter of Triangles:
The area of a triangle is computed using the formula:
A = (1/2)(base) • (height) . . .(1)
or
A = (1/2)bh
Figure: Area of a Triangle
The perimeter of a triangle is computed using the formula:
P = side1 + side2 + side3. . . .(2)
The area of a triangle is always expressed in square units, and the perimeter of a triangle is always expressed in the original units.