To rebuild the damaged ramp, you have to know length of AB, BC and DC.
Here AB = sqrt ( 100 +25 ) = 11.18
BC = 20 because sin 30 = 1/2 which is BD / BC.
Now AC = sq.rt ( 125 + 400)
Therefore DC = AC - AD = 22.91 - 5 = 17.91
So AB= 11.18, BC = 20, and DC = 17.91. You can rebuild the damaged ramp because you have determined damaged AB, BC and DC lengths.
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