Question

Given a triangle ABC whose angles B and C are 55° and 60° and the line AC is 15 units. Find the length of line AB

O 14.54 units
O 15.86 units
• 14.19 units
• 11.32 units

Answer 1

sin rule=b/sin B=c/sin C

180°-55°-60°=65°

15/sin 55°=C/sin 60°

15 sin 60°=C sin 55°

15 sin 60°/sin 55°= 15.858

= 15.86.