Question

A 3m high fence is on the side of a hill and tends to lean over. The hill is inclined at an angle of 20 degree to the horizontal. A 6.3 m brace is to be installed to prop up the fence. It will attached to the fence at a height of 2.5 m and will be staked downhill from the base of the fence. What angle, to the nearest degree, does the brace make with the hill?

Answer 1

the downhill angle of the fence is 110º ... 90º + 20º

using the law of sines ... sin(Θ) / 2.5 = sin(110º) / 6.3

Answer 2

Could you explain it in a little more depth.
thank you