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No, a triangle can have up to one right angle, but it doesn't have to be a right angle in order to be a triangle. A right triangle had one right angle. so, NO
It is 1 degree after a right angle. A right angle is 90 degrees so the smallest obtuse angle is 91 degrees.
I can be. Perpendicular is a "T", with the stem SOMETIMES moved to the left or right. So, yes, a right angle CAN be perpendicular.
To show a right angle you have to mark the inside corner so that it looks like a square.
The longest side is always opposite the right angle so the sides of the right angle are 3 and 4 units.