WAEC - Mathematics (2018 - No. 35)
Find the value of t in the diagram
63\(^o\)
117\(^o\)
126\(^o\)
234\(^o\)
คำอธิบาย
In the diagram,
\(\alpha\) = 180\(^o\) - 177\(^o\) (angles on a straight line)
\(\alpha\) = 63\(^o\)
t = 2 x 63\(^o\) (angle at centre = 2 x angle at circum)
= 126\(^o\)