# In a Pentagon, Two Angles Are 40° and 60°, and the Rest Are in the Ratio 1 : 3 : 7. Find the Biggest Angle of the Pentagon. - Mathematics

Sum

In a pentagon, two angles are 40° and 60°, and the rest are in the ratio 1 : 3 : 7. Find the biggest angle of the pentagon.

#### Solution

In a pentagon, two angles are 40° and 60° Sum of remaining 3 angles = 3 x 180°

= 540° – 40° – 60° = 540° – 100° = 440°

Ratio in these 3 angles =1 : 3 : 7

Sum of ratios =1 + 3 + 7 = 11

Biggest angle =(440 xx 7)/11= 280°

Concept: Sum of Angles of a Polynomial
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#### APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 16 Understanding Shapes
Exercise 16 (A) | Q 14 | Page 181