# Maths

from the top of a tower,the angle of depression of boat is 30 degree.if the tower is 20 metre high ,how far is the boat from the frot of the tower

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1. Draw the diagram. You can see that if the distance is x, then
20/x = tan30° = 1/√3
x = 20√3 m

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oobleck
2. From the top of tower, the angle of depression of a boat is 30degree if the tower is 2ocm high, how far is the boat from the foot of the tower

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3. Using thesame axis, draw the graph of y=2x-3

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