4.
The diagram shows two similar triangles.
In triangle ABC, AB = 10 cm and AC = 18 cm.
In triangle PQR, PQ = 6 cm and QR = 12 cm.
Angle ABC = angle PQR.
Angle CAB = angle RPQ.
(a) Calculate the length of BC.
.......................... cm
(2)
(b) Calculate the length of PR.
.......................... cm
(2)
(Total 4 marks)