ABCD is a rectangular piece of paper. Corners C and D are folded upwards as shown. ∠CFG = 13° and ∠DFE = 11 °
- Find ∠CGF
- Find ∠DFC
(a)
∠CGF
= 180° - 90° - 13°
= 77° (Angles sum of triangle)
(b)
∠DFC
= 180° - 11° - 11° - 13° - 13°
= 132° (Angles on a straight line)
Answer(s): (a) 77° (b) 132°