Question

Fig.
27. In Fig. 16.22, BE is parallel to CD, BA = BC, ABE = 20° and DCG = 60°. Determine FAC.
E
D
F
А
120°
60°
G
B
С
Fig. 16.22​

Answer 1

Answer:

6Euler's formula for solids ⇒ Faces+ Vertices− Edges =2

The given solid in the image is a Cuboid

∴ Faces of the cuboid =6

Vertices=8

Edges =12

putting these values in Euler's formula ⇒6+8−12=2

Hence, Verified.