An infinite number. All you need is any right triangle where
the product of the lengths of the two legs is 40.
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Imagine 4squared (16) divided by 4 (4). Therefore units squared divided by units would be units.
The area is 2 units squared.
units squared
The area of a circle is Pi X Radius squared. You can use the Pi button on your scientific calculator to get the closest answer possible, or you can use 3.14, which is what will be used here (and is usually a couple tenths off).The exact answer would be 16(Pi) units squared, but the rounded answer would be 50.24 units squared.
480 units squared -Apex