Question

find the angle sum of 14 sided

Answer 1

angle sum formula is (n-2)*180
n is the side. = (14-2)*180
=(12)*180
=2160

Answer 2

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$\large {\red {\bold {Here \: is \: your \: answer}}}$

Given that the polygon has 14 sides.
So, sum of external angles = 360 deg. (As the external angle of any polygon is always 360 deg.)

Now, Sum of internal angles. ....

Using the Formula...
Sum of internal angles = (n - 2) × 180, where n = no. of sides.

Therefore, (14 - 2) × 180
= 12 × 180
= 2160 deg.

$\large {\red {\bold {Hope \: it \: helps}}}$