If the area is in the form of a triangle, then 1.39 sq inches (approx).
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area = base x height ÷ 2 ⇒ height = 2 x area ÷ base ⇒ height = 2 x 15 ÷ 3 = 10 inches.
Its circumference is: 15*pi cm Its area is: pi*7.5^2 square cm
Area = 1/2*5*15 = 37.5 square units
With a rectangular prism with these dimensions, you'd have 2 sides with an area of 15*5, two sides with an area of 5*4 and two sides with an area of 4*15. The surface area is 15*5+15*5+5*4+5*4+4*15+4*15 = 310.
The area of a square is (the side length)2.That means (the side length) times (the side length).If you multiply 15 by 15, that will get you close.