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If by that you mean knowing only the diagonal and the width, then by the formula a2+b2=c2, where a is the length, b the width and c the diagonal. To find the width b, you need to calculate sqrt(c2-a2). For example, the width of a rectangle with length 3 and diameter 5 is sqrt(52-32)=4
This question can be solved using pythagorus, assuming the screen is a rectangle and 15in is the measurement of the diagonal (hypotenuse) of the screen. a2 = c2 - b2 a2 = 152 - 122 a2 = 225 - 144 = 81 a = 9in
If it's rectangular, you need to multiply length x width, to get the area. If the sides are expressed in cm, the area will be in square cm.
An A2 piece of paper is 420 × 594 mm, which is 0.420 x 0.594 m.
You multiply [ Length x Width x Height ]. You get a volume of [ 12 x 2 x 3 = 72 cubic cm ]