WAEC - Mathematics (1997 - No. 24)
The interior angles of a pentagon are 126o, 114o, y, 92o and 83o. Find the value of y.
85o
95o
105o
115o
125o
คำอธิบาย
Sum of the angle of a pentagon
= (2 x 5 - 4) x 90
= 540o
126 + 114 + y + 92 + 83 = 540
y = 540 - 415 = 125o
= (2 x 5 - 4) x 90
= 540o
126 + 114 + y + 92 + 83 = 540
y = 540 - 415 = 125o