Learn more at Area of Plane Shapes. To figure out the surface area of a triangle we need to know the base and the height. Area 5 3 15.
The area of a rectangle is length x width Examples of calculating the area of a rectangle.
Okay this is a little tricky but it makes more sense looking at the picture below. To calculate the area of a triangle you use the following formula. The area of a rectangle is length x width Examples of calculating the area of a rectangle. Find the areas of shaded regions which are combinations of squares triangles and circles.