If each interior angle is doubled of each exterior angle of a regular polygon with n sides, then the value of n is 

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

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

If two complementary angles are in the ratio of 2:3. find the ratio of square of smaller angle to square of greater?

Given that (a²+b²)=60, then find the value of (a+b)²+(a–b)².

If angle bisector of a triangle bisects the opposite side, then what type of triangle is it?

If the sum of the interior angles of a regular polygon be 1080 °, the number of sides of the polygon is 

Each internal angle of regular polygon is two times its external angle. Then the number of sides of the polygon is: