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A right-triangle has a right angle (90o) and two acute angles.
No. In fact, if one of the angles is not acute (a right angle or obtuse), the other two must be acute.
A trapezoid contains either:two acute angles and two obtuse angles orone acute angle, one obtuse angle and two right angles.
Yes. In this case a triangle is called an acute triangle.
no an acute triangle does not have a right angle. if it had a right angle, it would be called a right triangle. to be an acute triangle, the triangle needs two angles that are smaller than 90 degrees.