Working out the area of a triangle
Area = 1/2 x base x perpendicular height
Times the height of the perpendicular line and base of your triangle together.
E.G. 8 x 12
Once you have worked out the height times the length of the perpendicular line divide it by two.
8 x 12 = 96
96 divide by 2 = 48
Area = 48cm2