You multiply 3.14 by the diameter or 2 times the radius
for area you do pi or 3.14*radius squared
Answer:

Step-by-step explanation:
Cross multiply, isolate the variable, and divide by the coefficient to solve.

Plug back in to check.

<h3>
Answer:</h3>
The radius would be <em>3.5 units</em>.
Step-by-step explanation:
This is because a radius is always half of a diameter.
By using that,
7 ÷ 2 = 3.5 units
Since there was no measurement listed in the question, the answer would be in "units."
Answer
it think it is 2 and 4 if i am wrong i will edit my work
Step-by-step explanation:
Answer: 3 : 2
Step-by-step explanation:
Let A represents the total population of country A and B represents the total population of country B.
According to the question,

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But, Again according to the question,
The total population that claims that they are from A = one half of the total population of A and B.
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