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scZoUnD [109]
3 years ago
9

PLEASE HELP I really need it so please can you help me answer 1-18, please and PLEASE DONT GIVE DUM ANSWERS LIKE Things to know

when you answer:
Find the area of each circle and enter the answer in the space below. Use 3.14 for π and round your answers to the nearest hundredth if needed.
The formula for calculating the area of a circle is A = π​r​2 where pi (π) equals 3.14 and the radius (​r​) is half the diameter.

Mathematics
1 answer:
riadik2000 [5.3K]3 years ago
8 0

Answer:

Here is all of them \^o^/  just add mm²

Step-by-step explanation:

1. 380.13

2. 615.75

3. 254.47

4. 3.14

5. 615.75

6. 38.48

7. 19.63

8. 78.54

9. 95.03

10. 50.27

11. 38.48

12. 3.14

13. 78.54

14. 314.16

15. 380.13

16. 63.62

17. 706.86

18. 0.79

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zubka84 [21]

Explanation:

a. It is so easy to double a number that no approximation is necessary.

  31,000 × 200 = 3.1×10⁴ × 2×10² = 6.2×10⁶ exactly

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b. 6.2×10³ × 5.2×10⁶ ≈ 6×5×10⁹ = 3×10¹⁰ approximately

The approximation can be refined a bit by taking the ".2" into account:

  6.2×10³ × 5.2×10⁶ ≈ (6×5 + .2×(6+5))×10⁹

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c. 9×10⁶ -2.3×10⁴ ≈ 9×10⁶ approximately

A better approximation is to actually subtract an approximation of the smaller number:

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The actual value uses all of the digits of the smaller number:

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The accuracy required of an approximation, hence the work you expend improving accuracy, should depend on the need in the final application of the number. Often, approximations are used for budget or resource planning purposes where some "slop" is allowed or even expected.

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