If the graph of the equations x + y = 0 and 5y + 7x =24 intersect at (m, n), then the value of m + n is :

Equation of the straight line parallel to x-axis and also 3 units below x-axis is: 

The midpoints of AB and AC of a triangle ABC are X and Y respectively. If BC + XY = 12 units, then BC – XY is:

Two parallel chords are drawn in a circle of diameter 30 cm. The length of one chord is 24 cm and the distance between the two chords is 21 cm. The length of the other chord is 30 cm 

The area of a triangle with vertices A (0, 8), O (0, 0), and B (5, 0) is :

In the given figure, from the point P two tangents PA and PB are drawn to a circle with center O and radius 5 cm. From the point O, OC and OD are drawn parallel to PA and PB respectively. If the length of the chord AB is 5 cm. then what is the value (in degrees) of ∠COD?

The equidistant point from the vertices of a triangle is called its: 

AD is the median of a triangle ABC and O is the centroid such that AO = 10 cm. The length of OD (in cm) is