Geometry a
suppose m adc = (7x + 6)", m2 adb = (5x + 3)°, and m bdc = (3x -9).
what is the value of x?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?