# Technical Drawing - Exam Papers - Higher - 2003 - Building

### Question 5

On a contour map A and B are two points whose altitudes are 115m and 95m respectively. On the map B is located 80m east of A. A skew bore-hole at A is drilled in a northerly direction in plan and has an actual inclination of 65° to the horizontal plane. It reveals the top and bottom surfaces of a stratum at distances of 45m and 110m respectively from A.

A skew bore-hole at B is drilled in a southerly direction in plan and has an actual inclination of 50° to the horizontal plane. It reveals the top and bottom surfaces of the stratum at distances of 50m and 70m respectively from B.

(a) Determine the dip, strike and thickness of the stratum.

(b) Another skew bore-hole at A is drilled in an easterly direction in plan. The altitude at which it reaches the top surface of the stratum is 50m higher than the altitude at which it reaches the bottom surface of the stratum.
Determine the distance from A to the bottom surface of the stratum along the bore-hole.

(c) Determine the true angle between the two bore-holes drilled at A.

Scale 1 : 1000