Answer:
10 sides.
Step-by-step explanation:
In geometry, a decagon is a ten-sided polygon or 10-gon. The total sum of the interior angles of a simple decagon is 1440°. A self-intersecting regular decagon is known as a decagram.
13. 1,6
18. -15,12
19. -7, 1/2
let <ACB=<C,
Here h=26 due to opposite to right angle is hypotenuse and b=10 Is a base and p=24 due to opposite to the angle <C
so,
Cos<C=b/h
=10/26
=5/13
<span>24 3/4 miles is the distance
1/2 hour - is time
V=S/t
24</span>

/ 0.5 =

=49.5 miles per hour
Answer:
<h3>(-3,1) U (3,8) is the right answer.</h3>