Find the measure of angle a.
1 answer:
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Answer:
≈ 12.57 units squared
Step-by-step explanation:
The area of a circle is denoted by: , where r is the radius.
Remember that diameter is twice the radius, so since the diameter equals 4, we know that the radius r = 4/2 = 2.
Now, plug this in:
We can round 4pi to 12.57 units squared.
Hope this helps!