The under-sea-water tunnel that connects england and france is the world's longest tunnel called also the chunnel for the english channel. it actually consists of three tunnels built side by side. each tunnel is a half-cylinder that is 50,000 meters long and 4 meters high. how many cubic meters of dirt had to be removed to build the chunnel?

2400000pi cubic meters of dirt had to be removed to build the Chunnel.

Step-by-step explanation:

Volume of a half-cylinder can be stated as:

where

Thus, one half-cylinder tunnel volume is: =800000pi

Since there are 3 half-cylinder tunnels, 3×800000pi=2400000pi cubic meters of dirt had to be removed to build the Chunnel

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation:

attachment?

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