Round to 2 significant figures 0.000789

The rectangle on the right is the image of the rectangle on the left. what transformation would result in this image? reflection rotation translation dilation

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?

What is the circumference of a circle with an area of 50.24 cm²?