Δ DEF is right angled at E. If m∠D = 30°, what is the length of DE (in cm), if EF = 6√3 cm?

What is the area of this trapezoidal garden? (All measurements are in cm)

∆ABC is right angled at B. If cosA = 8/17, then what is the value of cotC ?

The curved surface area and the diameter of a right circular cylinder are 660 sq.cm and 21 cm respectively. Find its height (in cm).

If the measure of the interior angle of a regular polygon is 1800, then how many sides does it have?

The sum of the lengths of the edges of a cube is equal to the perimeter of a square. If the numerical value of the volume of the cube is equal to the numerical value of the area of the square, then the length of one side of the square is

A square ground is to be covered by planting 100 saplings on each side. How many saplings are needed in all?

Find the curved surface area (in cm2) of a right circular cone of diameter 28 cm and slant height 12 cm.

In ΔABC measure of angle B is 900. If cotA = 8/15, and AB = 0.8cm, then what is the length (in cm) of side BC?