Book Maths Puzzle Algebra

How can I find the area of a tower of a castle. The diameter is 7 but the tower has a open areas in the top each one has 3 cm of area.

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Book Other Question

the sides of a triangle touch a parabola and two of its angular points lie on another parabola with its axis in the same direction. prove that the locus of the third angular point is another parabola. Solve
48=6(x-1)-3x