In a test in Mathematics, 20% of the students obtained “first class”. If the data are represented by a Pie-Chart, what is the central angle corresponding to “first class” ?

What is the equation of the ellipse having foci (±2, 0) and the eccentricity 1/2?

What is the ratio in which the point C(2, 20/7) divides the line joining the…

What is the equation of the circle which passes through the points (3, -2) and…

The two circles x² + y² = r² and x² + y² – 10x +…

If the three consecutive vertices of a parallelogram are (-2, -1), (1, 0) and (4,…