Ini Jawapan Diperakui

Jawapan diperakui mengandungi maklumat yang boleh dipercayai dan diharapkan yang dijamin dipilih dengan teliti oleh sepasukan pakar. Brainly mempunyai berjuta-juta jawapan berkualiti tinggi, semuanya disederhanakan dengan teliti oleh ahli komuniti kami yang paling dipercayai, tetapi jawapan diperakui adalah terbaik di kalangan terbaik.
Not exactly a Geography question, but here goes. Since the units change when you’re measuring area or volume, let’s get those numbers first. 

A linear mile = 5,280 linear feet (ft) 
A square mile = 27,878,400 square feet (ft²) 
A cubic mile = 147,197,952,000 cubic feet (ft³) 

Ok, big numbers, right? So let’s just do the problem in feet to start with, and convert back later. 

12 mi x 5280 ft/mi = 63360 ft (east west distance) 
10 mi x 5280 ft/mi = 52800 ft (north south distance) 

Now for the area we simply multiply e/w by n/s 

63360 ft x 52800 ft = 3345408000 ft² 

To get that back into miles (SQUARE miles, remember) divide by 27878400. 

3345408000 ft² / 27878400 ft²/mi² = 120 mi² (Surface Area) 

Actually, since this is in whole miles, we could have simply multiplied 10 x 12 and gotten the same answer. 

But for the volume, since the depth is only a fraction of a whole mile, we’ll need those numbers in feet. 

Going back to our surface area of 3345408000 ft², we multiply that by the “average” depth (only in school!) of twelve feet. 

3345408000 ft² x 12 ft = 40144896000 ft³ 

To get that into cubic miles, we divide by 147197952000. 

40144896000 ft³ / 147197952000 ft³/mi³ = 0.27272727272727272727 mi³ 

In fraction form, that’s 3/11’s of a cubic mile 

So your answers are: 

3345408000 ft² or 120 mi² 

40144896000 ft³ or 0.2727272727272727 mi³ or 3/11 mi³