Grade 129 grade maths

How many sides does a Decagon have?
A
7
B
8
C
9
D
10

aman p

5 Years agoGrade 12

2 Answers

Vikas TU

5 Years ago

Dear student

Decagon have 10 sides , and each angle is 144 degreee.

Hope this will help

Feel free to ask querries.

Good Luck

Chers

ankit singh

5 Years ago

Explanation: We know that to calculate number of diagonals in octagon is Number of diagonals is= n × (n -3)/2 27= n × (n -3)/2 n (n-3) = 54 n2– 3n = 54 n2– 3n-54 = 0 (n + 6) (n – 9)=0 n=-6 or n=9 So that we are calculating the sides it should be positive, therefore sides of polygon has 27 diagonals is 9