Answer:
60°
Step-by-step explanation:
The sum of the interior angles of a polygon is
sum = 180° (n - 2) ← n is the number of sides
Here n = 5 ( pentagon ), thus
sum = 180° × 3 = 540°
let x be the size of the equal angles
Sum the interior angles and equate to 540
(3 × 140 ) + 2x = 540
420 + 2x = 540 ( subtract 240 from both sides )
2x = 120 ( divide both sides by 2 )
x = 60
Thus the size of 1 of the 2 equal angles = 60°
