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2 answers:
Answer:
2886.34 mm
Step-by-step explanation:
The radius of the disc is given to be 35 millimeters. This means that the distance from the edge of the large circle to the center is 35 millimeters.
We need to find the large circle area and subtract the small circle area from it.
Large circle area:
Area = π
= π
= 1225π
The radius of the small circle is half the radius of the large circle. 35/2 = 17.5
Small circle area:
Area = π
= π
= 306.25π
Large circle - small circle =
1225π - 306.25π = 918.75π
= 2886.3<u>4</u> mm
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Answer:
sum = ∑[n=1,5] 4^(n-4)
Step-by-step explanation:
First of all, you need to be able to describe the n-th term.
Here, we have ...
term #: 1, 2, 3, 4, 5
value: 4^-3, 4^-2, 4^-1, 4^0, 4^1
That is, the exponent of 4 is 4 less than the term number. So, the n-th term is 4^(n-4). The sum of the 5 terms shown is then ...