S=(n-2).180
(Solve for n)

Step-by-step explanation:

S = 180 × ( n - 2)

To solve for n divide both sides by 180°

That's

Add 2 to both sides in order to isolate n

That's

We have the final answer as

Hope this helps you

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )