Only one, and even that is only in some fonts.
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It is an acute angle.
A right angle triangle has a 90 degree angle and two acute angles whereas altogether the three angles add up to 180 degrees.
An angle of 30 degrees is an acute angle because it is greater than 0 but less than 90 degrees
less than 90 degrees
It depends on the triangle, whether it's an isoscelese, scalene, equlateral, obtuse, right angle or acute triangle. All the angles have to add up to 180 degres no matter what, so a right angle triangle could be 90, 45 and 45.