Question: A surveying method to find the distance between two points A and B , between which is an obstacle, is designated as a four sided

A surveying method to find the distance between two points A and B, between which is an obstacle, is designated as a four sided shape ACBD. If the angle CAD=49 and the angle ADC is 79 degrees and the length CD is 68ft, calculate the length AC.
A surveying method to find the distance between

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