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kozerog [31]
3 years ago
15

Please help me with this question

Mathematics
1 answer:
Alenkinab [10]3 years ago
5 0

Answer:

A

Step-by-step explanation:

Remark

f and d are equal (and acute) because they are corresponding angles.

82 and f are supplementary, so we can find f

Finding f

f + 82 = 180

f = 180 - 82

f = 82

Finding d

d = f

d = 82

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Step-by-step explanation:

From figure above, using triangle ratio

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From figure 2 in the attachment work done for elementary sclice

Wslice= 150.755.5^2.y^2.∆y.(485-y)/485^2

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Integrating the above

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Work done 1.69*10^12joules

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