let's recall that an equilateral triangle has all interior angles of 60°.
Check the picture below.
so as you can see, 2√3 = x = r, namely the radius of the circle.
Rate as BRAINLIEST, if any doubt ask.
7.) -2
8.) 2
9.) -21
10.) 28
11.) -6
12.) 27
13.) -22
14.)-23
15.)-28
16.) 13
17.) 28
18.) 25
19.) >
20.) <
Honestly don’t know am really sorry