WAEC - Mathematics (1992 - No. 24)
In the diagram above, ML//PQ and NP//QR, if ∠LMN = 40° and ∠MNP = 55°. Find ∠QPR
15o
25o
35o
40o
55o
คำอธิบาย
Draw line ANB// ML
< MNA = 40° (alternate angle AB/ ML)
< ANP = 55° - 40° = 15°
< PQR = 15° = < ANP (corresponding angles, PN // RQ)