If radius = 30, the circumference = 2*PI *radius =
<span>
<span>
<span>
188.4955592154
</span>
</span>
</span>
cm
The arc = 18*PI cm =
<span>
<span>
<span>
56.5486677646
</span>
</span>
</span>
The arc is (<span>
56.5486677646 / </span><span><span>188.4955592154) = one third of the
</span></span><span><span>
</span></span><span><span>circumference and so it subtends a central angle of 120 degrees.
</span></span><span><span>
</span></span><span><span>
</span></span>
Let's test each alternative :
2 x - 9 y = 38 ( 7,5 ) :
( 2 * 7 ) - ( 9 * 5 ) = 38
14 - 45 = 38
-31 ≠ 38 ( wrong )
( 4 , - 1 ) :
( 2 * 4 ) - ( 9 * ( - 1 ) = 38
8 + 9 = 38
17 ≠ 38 ( wrong )
( 3 , - 3 ) :
2 * ( 3 ) - ( 9 * ( - 3 ) = 38
6 + 27 = 38
33 ≠ 38 ( wrong )
( 1 , - 4 ) :
2* ( 1 ) - 9 * ( - 4 ) = 38
2 + 36 = 38
38 = 38 ( Correct alternative )
( 1 , - 4 ) is correct alternative
Since there are no answer choices, there are 3; Point, line and plane.
Answer:
It has 120 sides but mark the other guy brainliest
Step-by-step explanation: