JAMB - Mathematics (2019 - No. 37)
The angles of a polygon are given by 2x, 5x, x and 4x respectively. The value of x is
31°
30°
26°
48°
Paliwanag
Since there are 4 angles given, the polygon is a quadrilateral.
Sum of angle in a quadrilateral = 360°
\(\therefore\) 2x + 5x + x + 4x = 360°
12x = 360°
x = 30°