From the diagram, find angle P+ angle Q+ angle R + angle S + angle T

Draw a diagram to show refraction through a prism and mark angle i, angle r_1 , angle r_2 angle d, and angle of emergence.

If bisectors of angle A and angle B of a quadrilateral ABCD intersect each other at P, of angle B and angle C " at " Q, " of " angle C and angle D " at R and of " angle D and angle A at S then PQRS is a

triangle ABC ~ triangle PQR , angle A = 50^@ then angle Q + angle R =……….