China Naming Network - Weather knowledge - Distance between plumb hammer and splayed ring
Distance between plumb hammer and splayed ring
( 1) cos∠D=cos∠ABC= = 0.94，
∴∠D 20。
(2)ef = desin∠d = 85 sin 20 85×0.34 = 28.9(m)，
A total of 28.9×100 ÷17 =170 steps are needed.