A chord of length $32$ cm lies $30$ cm from the centre of a circle. Find the radius in cm.

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A cylinder has base radius $7$ cm and height $8$ cm. Find its volume in cm $^{3}$ .
A right-angled triangle has hypotenuse $87$ cm and one other side $60$ cm. Find the third side in cm.
A right-angled triangle has hypotenuse $13$ cm and one other side $5$ cm. Find the third side in cm.
In a right-angled triangle the two perpendicular sides are $20$ cm and $21$ cm. Find the length of the hypotenuse in cm.
Find the distance between $P (- 5, 4)$ and $Q (- 2, 8)$ .
Find the slope of the line through $(- 2, 4)$ and $(2, - 8)$ .