Answer:
150°
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 has 5 sides ), thus
sum = 180° × 3 = 540°
Sum the parts of the ratio, 3 + 3 + 3 + 4 + 5 = 18 parts
Divide 540° by 18 to find the value of one part of the ratio
540° ÷ 18 = 30° ← value of 1 part of the ratio, thus
5 parts = 5 × 30° = 150° ← largest angle
