exam Maths Puzzle Numerical Ability

please i need help with this problem: the shortest distance from the centre of a circle to a chord is 5 cm. find the radius (2d.p.) of the circle if the chord is 3*2 times longer than the radius.

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exam Other Question

f(x)=-2x^2+11x+7

find the line of symmetry of the given function.
Pyramid TABCD has a 20-cm square base ABCD. The edges that meet at T are 27 cm long. Make a diagram of TABCD, showing F, the point of ABCD closest to T. To the nearest 0.1 cm, find