The angles of triangle are in the ratio 3:4:5 the measure of the largest angle of the triangle is

What is the volume of the largest sphere that can be carved out of a wooden cube of side 21 cm?$$( π{22\over 7})$$

How many metres of 2-m-wide cloth will be required to make a conical tent with the diameter of the base as 14 m and slant height as 9 m ignore wastage?

Find the number of diagonals of a regular polygon, sum of whose interior angles is 2700⁰.

The difference between the length of two parallel sides of a trapezium is 12 cm. The perpendicular distance between these two parallel sides is 60 cm. If the area of the trapezium is 1380 cm², then find the length of each of the parallel sides (in cm).

What is the total surface area of a pyramid whose base is a square with side 8 cm and height of the pyramid is 3 cm? 

A wire is in the form of a circle of radius 98 cm. A square is formed out of the wire. What is the approximate length of a side of the square?

What is the area (in cm² ) of an equilateral triangle of side 20 cm?