acute is the angle that is smaller then 90 degrees obtuce is the anglee that is above 90 degrees
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That depends on the sizes of the other 2 angles if it's a right angle triangle then the other acute angle would be 70 degrees.
Yes. In this case a triangle is called an acute triangle.
An acute central angle will subtend an acute arc, or one that is less than 1/4 of the whole circle.
No. In fact, if one of the angles is not acute (a right angle or obtuse), the other two must be acute.
yes. to be and acute angle, all angles must be acute. Obtuse angles only one angle has to be obtuse. Right angles only need one too. Acute has to have every angle to be acute, if one angle is obtuse or right, it's automatically no an acute Angle anymore.