If one of the angles in a triangle is exactly 90 degrees, then it is a right-angle triangle.
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there will be a right angle in the triangle.
A right angle triangle
Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!
The sine of an angle in a right triangle is opposite/hypotenuse, where opposite is the only side that is not adjacent to the angle you want to find the sine of, and the hypotenuse is the side opposite the right angle in the triangle. Just find opposite/hypotenuse.
A right angle triangle has a right angle and two acute angles that all add up to 180 degrees.