book Maths Puzzle Numerical Ability

What is the area of a triangle with the sides of 2.6 ft., 3.4 ft., and 4.1 ft.

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How do you prove that 5 is a prime number? A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 35feet. if the distance across the top of the mirror is 54inches, how deep is t