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

If the angles of a triangle are in the ratio of 1:4:7, then find the ratio of the greatest angle to the smallest angle.

If the angles of a triangle are in the ratio of 2:3:7, then find the ratio of the greatest angle to the smallest angle.

The largest and the smallest angles of a triangle are in the ratio of 3:1 respectively. The second largest angle of the triangle is equal to 56°. What is the value of largest angle of the triangle?

Four coins whose diameter is 12.6 cm are placed in such a way that one coin touches the other coin, find the area between them.

The distance between the center of two equal circles each of radius 3 cm, is 10 cm. The length of a transverse common tangent is 

If the circumradius of an equilateral triangle ABC be 8 cm, then the height of the triangle is 

Bhuvnesh has drawn an angle of measure 45⁰7’ when he was asked to draw an angle of 45⁰. The percentage error in his drawing is