A triangle is a three sided figure that has three angles.
A triangle is half of a parallelogram. So the formula to find the area of a triangle is (b-base x h-height) divided by 2 (to get the height of a triangle you make a parallel
line from the base to the tallest vertex).
For example the base of the triangle is 2 cm and the Height of the triangle is 4 cm
First you have to multiply the 2 by the 4 to get 8
Then you divide 8 by 2 to get the area which is 4 cm
Here is a site that can help
here is a video