If two corresponding sides and the angle between them, of a triangle are equal to those of another triangle. Then the angles are:

The segment $XY$ is parallel to side $AC$ and the segment $XY$ divides the triangle in two equal area, then $\frac{AX}{AB}$ is

In a triangle ABC, D and E are the midpoints of AB and AC and if AB = 12 cm, BC = 9 cm and AC =10 cm, then the measure of DE is:

In a right-angled triangle $ABC$, the right angle is at $A$ and a perpendicular $AD$ is drawn cutting $BC$ at $D$, then $A{D}^{2 }$is: