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jarptica [38.1K]
3 years ago
11

A person of height 1.6m up to the eye level is standing at a point 2m away from the bank of the river and found an angle of elev

ation of 30°. find the width of the river.​
Mathematics
1 answer:
natima [27]3 years ago
5 0

Step-by-step explanation:

tan30° = Height of person / (Distance away from river bank + river's width) = 1/√3.

Therefore 1.6m / (2m + x) = 1/√3

By cross multiplication, 1.6√3 = 2 + x.

Hence, x ≈ 0.77m.

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Solution for what is 147.1% of 155

155/x=100/147.1
(155/x)*x=(100/147.1)*x       - we multiply both sides of the equation by x
155=0.67980965329708*x       - we divide both sides of the equation by (0.67980965329708) to get x
155/0.67980965329708=x 
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x=228.005

now we have: 
147.1% of 155=228.005

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