If certain sum, at simple interest turns into thrice of actual amount in 4 years. Find out time to become the amount thirteen times of initial amount? 

Find out the equation of line which is perpendicular to 2x - 3y = 5 and passes through point (1,1).

$$\sqrt{ {1-sinA\over1+sinA}}$$ is equal to ?

Find out value of Cosec $$\left(-{5π\over3} \right)$$?

In ∆ABC, AC = BC and ∠BAC = 40°. If BC is extended to D such that BC = CD, find out ∠ADC = ?

Given that DE || BC, AD : DB = 3 : 4, find out ar(∆ADE)/ar(∆ABC)?

A polygon has 14 sides then find out No. of diagonals in that polygon. 

If Diagonal of rectangle is 41 cm and one side of Rectangle is 9 cm Then find out Ratio of perimeter and area of Rectangle?