pi/2 radians.
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In a right triangle, all the angle measurements together add up to be 180 degrees. And since it is a right triangle, one of the three angles is 90 degrees so if you are given one of the angles other than the right angle's measurements, you can find the angle measurements. Here's an example: There is a right triangle. One angle measures to be 45 degrees. What is the missing angle measure? Well we know that one angle must be 90 degrees and the other (as we were told) is 45 degrees. 90+45=135 and we know that a right triangle=180 degrees total and 180-135= 45. The missing angle is equal to 45 degrees! hope this makes sense and it helped.
It is a scalene triangle other than a right angle triangle
One way is to use a protractor. There are others
It depends on how many degrees the acute angle is. A right angle is 90 degrees so it would be 90 degrees added to whatever the two other sums of the angle are are. An acute angle as the measurements of 0 degrees to 90 degrees, actually basically to 89.
The interior angle measurements of a regular pentagon is 180-(360/5), or 108 degrees.