Answer:
missing angle measure = 100°
Explanation:
the sum of the interior angles of a polygon is
sum = 180° (n - 2 ) ← n is the number of sides
a pentagon has n = 5 , then
sum = 180° × (5 - 2) = 180° × 3 = 540°
given sum of 4 angles = 440° , then
missing angle = 540° - 440° = 100°