Question

Besar sudut BFG adalah ?

Answer 1

(4x + 30) + (3x + 10) = 180
7x + 40 = 180
7x = 140
x = 20

4x + 30 = (4 x 20) + 30 = 110 derajat

Answer 2

Sudut CEF = Sudut AFG = 3x + 10°
Sudut BFG = Sudut DEF = 4x + 30°
Sudut AFG + Sudut BFG = 180°
3x + 10° + 4x + 30° + 180°
7x + 40° = 180°
7x = 180° - 40° = 140°
x = 140° : 7 = 20°
Sudut BFG = 4x + 30°
= 4 x 20° + 30°
= 80° + 30°
=110°