Final answer:
A 30-degree - 60-degree - 90-degree triangle is a specific type of right triangle with angle measures of 30, 60, and 90 degrees.
Step-by-step explanation:
A 30-degree - 60-degree - 90-degree triangle is a specific type of right triangle. In this triangle, one angle measures 30 degrees, one angle measures 60 degrees, and the remaining angle is a right angle, measuring 90 degrees. The sides of this triangle have a special ratio: the side opposite the 30-degree angle is half the length of the hypotenuse, and the side opposite the 60-degree angle is √3 times the length of the side opposite the 30-degree angle.
For example, if the side opposite the 30-degree angle is 2 units long, the hypotenuse would be 4 units long, and the side opposite the 60-degree angle would be 2√3 units long.