Which of the below methods is used for interpolating contour points between 2 points?

Which of the below methods is used for interpolating contour points between 2 points? Correct Answer Arithmetic calculation

There are 3 different ways to interpolate contour points between 2 points; arithmetic calculation, estimation and graphical or mechanical method.

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Which of the following statements is/are true? i. Contour lines cross valley line at 90°. ii. Contour lines cross ridge line at 90°. iii. Contour lines are widely spaced where ground has steep slope.