book Maths Puzzle Numerical Ability

find the length of the radius of a circle diameter measures 10 inches

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book Other Question

What is the area of a triangle if the sides are 2.6 ft.,3.4 ft., and 4.1 ft. the numbers a, b, c are the terms of a geometric sequence so that
a+b+c=35 and abc=1000

find a, b and c