Answer: 17
21-4=17
4+17=21
21+17=38 and so on..
Answer:
Yes it is parallelogram because diagonals bisect each other.
Well, basically there are
acute angle, right angle, obtuse angle ..
and also we use concurrent angles, corresponding angles, alternate angles, vertically opposite angles,..
..hope it helped a bit
C=πd where C=circumference, π=the constant pi, and d=diamter
d=C/π and since we are told that C=9π
d=9π/π
d=9
