Construction of triangle's shadow given triangle ABC with its sides equal to 7/5 ratio of the corresponding sides of the triangle ABC

Construct XYZ in which YZ = 4•2 cm angle Y = 120π and XY= 3•9cm draw XP perpendicular to SAY ( produce if required)
If A is an event in A random experiment such that p(A):p(A')=3:5 find p(A) and p(A')