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kodGreya [7K]
3 years ago
9

The paper cup is 9 cm tall and the circular opening has a radius of 2.5 cm.

Mathematics
1 answer:
Tema [17]3 years ago
4 0

Answer:

181cm^2

Step-by-step explanation:

The minimum amount of paper needed to make the cup to the nearest whole number will be = to the surface area of the cylinder = A=2πrh+2πr2.

Where π= 22/7, r = 2.5cm, h = 9cm

A = 2×22/7×2.5×9+2×22/7×2.5×2.5

A= 141.428+39.285

A= 180.713

A = 181cm^2

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Since there are 360 degrees in your circle, that would be representative to 100 (because both are the total of what you want to find), and x would be representative to what degrees 65 is equal to.

your ratio should look like,

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cross multiply and get

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It looks hard to read like this, but if you write it out on your paper it should make more sense!

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