Answer:
x = 108°
Step-by-step explanation:
Formula to determine the sum of interior angles of a polygon is,
Sum of interior angles = (n - 2) × 180°
Here, n = Number of sides of the polygon
From the picture attached,
Number of sides 'n' = 6
m∠A + m∠B + m∠C + m∠D + m∠E + m∠F = (6 - 2) × 180°
143° + 160° + 51° + 133° + 125° + x° = 720°
612° + x° = 720°
x = 720 - 612
x = 108°
