Question

The true thickness (t, in m) of bed B in the given diagram is ..... 

Hint:

To calculate the true thickness of a bed, divide the apparent thickness by the sine of the dip angle.

Answer 1

Correct Answer: 10

Given:

• Apparent thickness (measured horizontally): 20 m
• Dip angle: 30°

Concept:

Looking at the diagram:

• The 20 m is the horizontal distance across bed B
• The dip angle is 30°
• t is the true thickness perpendicular to the bedding

Relationship:

$$t = \text{Horizontal width} \times \sin(\text{dip angle})$$

Calculation:

$$t = 20 \times \sin(30°)$$

$$t = 20 \times 0.5$$

$$t = 10 \text{ m}$$

Answer: 10 m