In the figure above, `Delta ABC` is similar to `Delta XYZ`, what is the value of cos A?

In the figure above, triangle ABC is similar to triangle DEF . What is the value of cos(E) ?

In the figure above, triangleABC is a right triangle. What is the value of x?

In triangle XYZ above, what is the value of p?

If Delta ABC is right angled at C, then find the value of cos (A + B)

In the figure shown above, ABC is a triangle right angled at B. What is the value of angle A, in degrees?

In the figure above, what is the area of triangle YAZ?

In a Delta ABC, if cos A=cos B cos C, what is the value of tan A-tan B tan C?

In a Delta ABC, if cos A=cos B cos C, what is the value of tan A-tan B-tan C?

In the figure above, triangle PQR is a similar to triangle XYZ (not shown) . IF PQ:XY=QR:YZ=PR:XZ=4:5 , what is the measure , in degrees, of angle Y?