DEFG is a rectangular piece of paper. Corners F and G are folded upwards as shown. ∠FJK = 21° and ∠GJE = 15 °
- Find ∠FKJ
- Find ∠GJF
(a)
∠FKJ
= 180° - 90° - 21°
= 69° (Angles sum of triangle)
(b)
∠GJF
= 180° - 15° - 15° - 21° - 21°
= 108° (Angles on a straight line)
Answer(s): (a) 69° (b) 108°