exam Maths Puzzle Numerical Ability

6x^2+5xy-21y^2

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A homeowner wishes to insulate her attic withy fiberglass insulation to conserve energy. The insulation comes in 40 cm wide rolls that are cut to fit between the rafters in the at 1. how many square units are in the area of the circle described by x^2+y^2=25? expres your answer in terms of pi.