C = π×D
D = C/π = (5.3 mm)/π ≈ 1.69 mm
Answer:

Step-by-step explanation:

Here are the answers:
1.) DC=D’C’
2.) 3.) ED=E’D’
<h3>
Answer: 72 words per minute</h3>
Work Shown:
1 hour = 60 min
2 hours = 120 min (multiplied both sides by 2)
2 hours + 30 min = 120 min + 30 min = 150 min
speed = (number of words typed)/(time taken)
speed = (10800 words)/(150 min)
speed = (10800/150) words per minute
speed = 72 words per minute