Answer:
20.57 cm
Step-by-step explanation:
Circumference of half circle = diameter + half of circumference

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71/20 i believe. Is it multiple choice?
Answer:
11/12
Step-by-step explanation:
3 3/4 - 2 5/6
Convert to improper fractions
15/4 - 17/6
Find a common denominator (12)
45/12 - 34/12
Subtract
11/12
Hope this helps :)
Would it be a ratio, if it is it would most practically be 10:40 and if in simplest form it would be 1:4 or just you photo math