JAMB - Mathematics (1991 - No. 42)
In the figure above, Find the value of x
130o
110o
100o
90o
คำอธิบาย
From the diagram above
x = 60 + 70 = 130º
(sum of angles on a straight line was used to obtain 60º and 70º, and alternate angles are equal to obtain the value of x)