JAMB - Mathematics (2019 - No. 17)
From the cyclic quadrilateral MNOP above, find the value of x.
16°
25°
42°
39°
Giải thích
The sum of two opposite angles of a cyclic quadrilateral = 180°
\(\therefore\) (2x + 18)° + 84° = 180°
2x + 102° = 180° \(\implies\) 2x = 78°
x = 39°