WAEC - Mathematics (2002 - No. 39)
In the diagram, calculate the value of x
35o
80o
100o
115o
説明
From the diagram above.
115º = A (corresponding angles)
t + 115º = 180° ( sum of <s on a straight line)
t = 180º - 115º = 65º
x = 35º + 65º = 100º ( ext. <s of a triangle = the sum of the two opposite interior <s)