All triangles have three heights, and the right angle formed by two sides of a right triangle is two heights of a right triangle. As shown below: The three sides of AC, BC and CD are called the height of a triangle.

Extended data:

Special properties of right triangle;

1, the sum of squares of two right angles of a right triangle is equal to the square of the hypotenuse.

2. In a right triangle, two acute angles are complementary.

In a right triangle, the center line of the hypotenuse is equal to half of the hypotenuse. This property is called the hypotenuse midline theorem of right triangle.

4. The product of two right angles of a right triangle is equal to the product of hypotenuse and hypotenuse height.

5. Projective Theorem, also known as Euclid Theorem: In a right triangle, the height on the hypotenuse is the median term of the ratio of the projection of two right-angled sides on the hypotenuse, and each right-angled side is the median term of the ratio of the projection of this right-angled side on the hypotenuse to the hypotenuse. It is an important theorem of mathematical graphic calculation.

6. In a right triangle, if there is an acute angle equal to 30, then the right side it faces is equal to half of the hypotenuse.

References:

Baidu Encyclopedia _ Right Triangle