How many triangles can be constructed with angles measuring 120°, 40°, and 10°?

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Triangle xyz has vertices x(1,3), y(0,0)

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?