How do you tell the difference between a obtuse angle, a right angle and a acute angle?

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )

Parallelogram rstu is a rhombus. m∠r = 120° what is m∠t = 120 (what is m∠rsu? )