The correct answer is:
C. The polygon with 8 sides and a concave shape (attached)

It could be c but I’m not sure
Answer:
=18/20
Step-by-step explanation:
• 25 - 7 = 18
• 30 - 10 = 20
= 18/20
if u reduce = 9/10
Perimeter = namely the length of outside bordering,
well, this is a PENTAgon, or PENTA=5 or namely 5 sides, is regular so each side is the same length, so we have a polygon with 5 sides each measuring 40cm, well, its perimeter is just 40+40+40+40+40 = 200.