What is the obtuse angle measurement?

Which of the following is an abtuse angle ? 

1/2 of a right angle is

1/6 of a right angle is

The shape of an instrument box is ______.

What is the acute angle measurement?

In Δ ABC, ∠A = 35^o, ∠B = 60^o, Find ∠C?

3 times of a right angle is

In a triangle angle A = 80^o, angle B = 30^o_. Then the value of the angle C is ---------

In a right angled triangle ΔABC, ∠A = 60^o find the other two angles?