What will be the area (cm²) of the curved surface of an elliptical cylinder whose height and diameter are 10 cm and 8 cm respectively?

X and Y are centres of circles of radius 9 cm. and 2 cm respectively XY=17 cm. Z is the centre of a circle of radius r cm which touches the above circles externally. Given that - ∠xzy = 90^o the value of r is -

If the area of a circle, inscribed in a equilateral triangle is 4 π cm², then what is the area of the triangle?

Abdul prepared 42 litres of medicine and filled it in bottles of 280 ml each. Find how many bottle would be required?

The age of a mother 10 years ago was thrice the age of her son. 10 years hence, the mother's age will be twice that of 9 her son. The ratio of their present ages is :

A is 4 years younger than B. B is 12 years younger than C. 4 years hence the ratio between C and A is 9:5, Find the age of B.

An amount doubles itself in 5 years simple interest. What is the rate of interest per year?

If the sum of a number and its reciprocal be 2, then the number is-