Use the right triangle in the illustration and the Pythagorean theorem to find the unknown side.a = 1.29 km, b = 4.12 kmThe unknown side c is _____ km.
A. 4.31
B. 4.46
C. 1.61
D. 5.41
E. 3.91
Answer: A
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and focus at 
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?
A. ?
B. ?
C. ?
D. 
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+ 
2 + 
3 + ... + 
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+ 
2 + 
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+ 
2 + 
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2 + 
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n