exam Maths Puzzle Numerical Ability

How does one prove that the ratio of the areas of similar polygons equals the similarity ratio squared?

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exam Other Question

i need to solve -2x+y+z=-2
5x+3y+3z=71
4x-2y-3z=1

i have to solve for x,y, and z PLEASE HELP!!!! The denominator of a certain fraction is three more than twice the numerator. If 7 are added to both terms of the fraction, the resulting fraction is 3/5. Find the original fractio