Area of a Right Triangle
The right triangle has a right angle (90°), so its height coincides with one of its sides (a) and its base with the other side (b).
The area of a right triangle is half the product of the two sides that form the right angle (legs a and b):
Apply the above formula:
And we have that the area is 6 cm2.
Finding the Area of a Right Triangle with the Geometric Mean Theorem
If the altitude (h) is drawn to the hypotenuse (c) of a right triangle, each leg (a and b) of the right triangle is the geometric mean of the hypotenuse and the segment of the hypotenuse adjacent to the leg (n or m).
So, we have the following formula:
This is a useful method if the legs (a and b) are unknown.
Download this calculator to get the results of the formulas on this page. Choose the initial data and enter it in the upper left box. For results, press ENTER.
Note. Courtesy of the author: José María Pareja Marcano. Chemist. Seville, Spain.
Table of Triangle Area Formulas
You can see the table of triangle area formulas . Depending on the type of triangle you may need one element ( equilateral triangle), two (base and height) or three (as long as they are not the three angles).
AUTHOR: Bernat Requena Serra