One ring in the Stonehenge monument was originally made of 30 stones, each about 6.5 feet wide, 3 feet thick, and 13 feet tall. What is the approximate volume of the 17 stones that remain today? PLEASE HELP :(

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

Me. i can't figure out this question. give an explanation too. .

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?