Find the length of a side of a rhombus whose diagonals are 6cm and 8cm

Each of the interior angles of a regular polygon is 140°. How many sides has the polygon?

If Cos \(\theta\) = \(\frac{12}{13}\). Find 1 + cot\(^2\)\(\theta\)

A cylinder pipe, made of metal is 3cm thick.If the internal radius of the pope is 10cm.Find the volume of metal used in making 3m of the pipe.

If the heights of two circular cylinders are in the ratio 2 : 3 and their base radii are in the ratio 9:8, What is the ratio of their volumes?