Question

hello guys ☺☺☺☺

regular polygon


please you say me that

1 (n-2) x 180
2( 2n - 4) x 90 / n

bro in two rule in differce and which question it is in used I confused please help me

I

Answer 1

Bro if you take my advice then choose the first one it is more appropriate then 2nd one.
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Have a Nice Day...

Answer 2

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formula (1) : ( n - 2 ) × 180 is used to find the total measure of a regular polygon .
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example : let we take two regular polygons

(1) triangle, no. of sides (n )= 3

total measure = ( 3 - 2) × 180 = 180°

(2) Pentagon, number of sides (n) = 5

total measure = ( 5 - 2 ) × 180= 540°

now come to your second formula ,

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formula 2 : ( 2n - 4 ) × 90 / n
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now , you can simplify this formula little further by taking 2 common out there.

we can written it as

( n - 2 ) × 180 / n ( easy to learn)

example :
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Find each interior angle of a regular triangle :
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no. of sides in r.∆ = 3

each interior angle = ( n - 2 ) × 180 / n

= ( 3 - 2 ) × 180 / 3 = 180 / 3 = 60 °

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similarly , you can find each interior angles of other regular polygons too.
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