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Slav-nsk [51]
2 years ago
14

Does anyone know the perimeter and the area of them?

Mathematics
1 answer:
sergejj [24]2 years ago
4 0
Perimeter: 1+4+4+2 = 11
perimeter: 2+9+4+6+7+3 = 31
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What would be the volume of (a) air (b) plastic in a ball with 25cm diameter made from plastic 2mm thick?
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Answer:

Part a) The volume of the air is V=7,794.78\ cm^{3}

Part b) The volume of the plastic is V=386.45\ cm^{3}

Step-by-step explanation:

we know that

The volume of the sphere is equal to

V=\frac{4}{3}\pi r^{3}

step 1

Find the volume of the complete ball (air +plastic)

we have

r=25/2=12.5\ cm ------> the radius is half the diameter

substitute

V=\frac{4}{3}\pi (12.5)^{3}

V=8,181.23\ cm^{3}

step 2

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we have that

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2 mm=2/10=0.2 cm

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V=\frac{4}{3}\pi (12.3)^{3}

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step 3

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we know that

The volume of the plastic is equal to the volume of the complete ball minus the volume of the air

so

8,181.23\ cm^{3}-7,794.78\ cm^{3}=386.45\ cm^{3}

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