The height on the hypotenuse AB is the vertical line passing through point C, as shown in figure AB, which is CD.
A right triangle is a geometric figure with a right angle. There are two kinds of right-angled triangles: ordinary right-angled triangles and isosceles right-angled triangles. It conforms to Pythagorean theorem and has some special properties and judgment methods.
There are two kinds of right-angled triangles: ordinary right-angled triangles and isosceles right-angled triangles (special cases). In a right triangle, the opposite side of the right angle of the right triangle is also called a "chord". If the lengths of two right-angled sides are not equal, the short side is called "hook" and the long side is called "strand".
Extended data:
The method of judging right triangle;
Judgment 1: A triangle with an angle of 90 is a right triangle.
Decision 2: If yes, then the triangle with sides A, B and C is a right triangle with hypotenuse C (the inverse theorem of Pythagorean theorem).
Decision 3: If the opposite side of the 30 internal angle of a triangle is half of a certain side, the triangle is a right triangle with this long side as the hypotenuse.
Decision 4: A triangle whose two acute angles are complementary angles (the sum of the two angles is equal to 90) is a right triangle.
Decision 5: If two straight lines intersect and the product of their slopes is negative reciprocal, then the two straight lines are perpendicular to each other. Then this triangle is a right triangle.
Decision 6: If the median line of one side of a triangle is equal to half of its side, then the triangle is a right triangle. Reference right triangle hypotenuse midline theorem
Decision 7: A triangle with an angle of 30 is a right triangle if its opposite side is equal to half of its adjacent side.
References:
Baidu Encyclopedia: Right Triangle