You mean the surface area, right? Assuming the balloon is approximately spherical, you can measure the diameter, divide by two to get the radius & plug that into this formula.
A=¾πr²
Where A is the area, r is the radius and π is the ratio of the circumpherence to the radius of a circle. 3.14 or 22/7 are good approximations to π, also a decent calculator will have a better approximation built in. To look it up search for "pi" (that's the Greek letter's name).
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Area(air) = 2
-- Find out the population of the area. -- Find out the area of the area. -- Divide the population by the area. The result is the population density of the area.
this is funny cause i took an online test with this question
The formula to find the area of an octagonal pyramid is area of base plus area of sides.
To find the area of 3ft by 1ft, you multiply the two. So the area is 3 square feet.