A right angle is 90 degrees.
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Yes, there is a 45 degree angle, and it is known as an acute angle.
it is called an obtuse angle - well im pretty sure
The Sine function (abbreviated sin) takes an angle and gives a ratio which is based on the sides of a right triangle. If you have a right triangle, and one of the angles (not the right angle) is labeled y then sin y equals the length of the side opposite of angle y divided by the length of the hypotenuse. The hypotenuse of a right triangle is the longest side, and is always opposite of the right angle.
Equilateral, isosceles, scalene and right angle triangles.