20 The triangles ABC and XYZ are similar and ABCˆ = XYZˆ . BACˆ = x°, YZXˆ = y° where x ≠ y . AB = 3 cm, XY = 4 cm and YZ = 5 cm. (a) Express ABCˆ in terms of x and y. (b) Find BC. (c) Write down the value of area of triangle ABC/area of triangle XYZ.