approximately how many diameters does it take to equal the measure of a circle's circumference?
a.1
b. half the diameter
c. it depends on the size of the circle
d. 3.14

1. are the triangles similar and if so why? what is the value of x? show your work.

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?

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2