Mathematics

1. Find the circumference of the given circle. Round to the nearest tenth.

(Circle with radius of 3.5 cm)

-22.0 cm
-38.5 cm
-11.0 cm
-42.8 cm

2. Find the area of the given circle. Round to the nearest tenth.

(Circle with a diameter of 12 feet)

-11.0 ft
-38.5 ft
-42.8 ft
-113.0 ft

3. Find the diameter of a circle with a circumference of 50 mm. Round your answer to the nearest tenth.
-16.0 mm
-26.4 mm
-8.4 mm
-33.5 mm

4. Find the area of a circle with the given radius or diameter. Round your answer to the nearest tenth.
Diameter = 42.0 mm

-137.6 mm
-376.7 mm
-1,384.74 mm
-6,027.0 mm

I believe the answers are:

1. 22.0 cm
2. 113.0 ft
3. 16.0 mm
4. 1,384.74 mm

I know many of you are probably busy most of the time, but if it is possible, please respond today. I don't mean to rush any of you, but thank you if you respond soon. :)

- Shadow

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  1. 1. yes
    2. yes
    3. yes
    4. yes

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    Damon
  2. 1. Yes; use the formula 2*3.14*r. In this case, 2*3.14*3.5 = 21.98. Round it up to the nearest tenth and you have 22.0 cm.
    2. Yes; use the formula 1/4*3.14*d. In this case, 1/4*3.14*12 = 113.1. Round it up to the nearest tenth and you have 113.0 ft.
    3. Yes; use the formula d = c/3.14. In this case, d = 50/3.14 = 15.92. Round it up to the nearest tenth and you have 16.0 mm.
    4. Yes; use the same formula as in question 2; 1/4*3.14*d. In this case, 1/4*3.14*42.0 = 1385.44. Round it up and you have 1,384.74

    So, based on my understanding, all of your answers are correct. If you want all of your answers confirmed by an experienced math teacher, wait for Ms. Sue to check your answers.

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  3. Both Damon and Dr. Mathematical are right! Thank you so much! :D

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  4. Thank you so much Damon and Dr. Mathematical for checking my answers. :) I just wanted to make sure they were right. :)

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  5. Shadows = Dr. Mathematical = drawingwings8

    Oh, my! Answering himself!!

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    Writeacher

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