Answer:
31.415...
Step-by-step explanation:
c=piD
circumference=pi times diamiter
radius=2D
pi times 10=31.415...
31.4 (simplified)
C≈2π*5
C≈31.41593 (full answer)
perpendicular means negative reciprocal so it would be -1/3
17.043956
530.087 trust me