Free interactive math game: Triangle Area — Area = ½ah. Part of the Geometric Shapes category on MathKite.
Taken from the generator that powers this exercise. A fresh set appears every time the page is opened, and the printable worksheet holds ten of them.
How much surface a triangle covers — always exactly half of some rectangle.
Multiply the base by the height and halve the result. The height must be perpendicular to the base.
A base of 10 and a height of 6 gives 10 x 6 : 2 = 30.
Forgetting the halving. A triangle is exactly half of the rectangle around it.