JEE Main · MathematicsMedium

$The number of diagonals in a polygon with n = 10 sides is?$

A. $35$
B. $45$
C. $25$
D. $40$

Show correct answer & step-by-step solution

Correct answer: A — $35$

Solution

The number of diagonals in an n -sided polygon is given by (2 n) - n . For n = 10, this is (2 10) - 10 = 45 - 10 = 35 .

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