Look at the picture......
The value of X is D. 25
Every triangle adds up to 180 degrees so you just add up the given numbers, then subtract that number from 180 and that is your answer.
The x-intercept is + 6 and the y-intercept is + 10
Y = 2x + 0.5
or
y = 2x + 1/2
If it is circle and the circle have the center at point O then the OP=1/2of length AB.