90/6 = 15
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A right triangle is a triangle in which one angle is a right angle (that is, a 90-degree angle). The relation between the sides and angles of a right triangle is the basis for trigonometry.
A 90o angle is also called a Right Angle, so a triangle that has one 90o angle is a Right angle triangle.
They have atleast one 90 degree angle.
A right triangle has one 90-degree angle.