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Lubov Fominskaja [6]
3 years ago
10

The length of a rectangle is 10cm and breadth is 5cm. find its perimeter.​

Mathematics
1 answer:
Veronika [31]3 years ago
7 0

Answer:

Perimeter of rectangle = 30 cm

Step-by-step explanation:

Perimeter of rectangle = (length + width) x 2

-- width or breadth --

Perimeter

= (10 + 5) * 2  

= 15 * 2

= 30 cm

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Step-by-step explanation:

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Mr. Schordine wants to fill up enough helium balloons to allow him to fly through the skies. He weighs 84 kilograms. He knows th
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Answer:

There is needed around 311 balloons to fulfill Mr. Schordine’s dream of flight.

Step-by-step explanation:

First, we need to calculate the volume of each balloon by considering the balloons as a sphere:    

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

Where:

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V = \frac{4}{3}\pi r^{3} = \frac{4}{3}\pi (0.4 m)^{3} = 0.27 m^{3}

Knowing that 1 m³ of helium is able to lift about 1 kg, that Mr. Schordine weights 84 kg, and that each ballon has 0.27 m³ of helium, the number of balloons needed are:

N = \frac{1 m^{3}}{1 kg}*84 kg*\frac{1 balloon}{0.27 m^{3}} = 311.1 \: balloon              

Therefore, there is needed around 311 balloons to fulfill Mr. Schordine’s dream of flight.      

 

I hope it helps you!

6 0
3 years ago
Estimate 14.75 divided by 2.85 by using compatible numbers.
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