I am standing at point A on one side of a river and wish to measure the distance across a river to a house H on the other side. I walk 50ft along the river bank to point B and measure the angle ABH to be 18°. Find the distance across the river

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A on one side of a river and wish to measure the distance across a river to a house H on the other side. I walk 50ft along the river bank to point

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