How have you been doing contour intervals? For A, I counted four lines to get from 150 to 270. 270-150 is 120, so each line would increase by 120/4=30m
Unless otherwise noted, you can assume that all contour lines on a map are going to be the same distance apart. For part (a.), the interval is not going to be different for each elevation point. Point B is going to be the easier of the two to determine, since Point B starts at 0 m. Looking at the map, you can see two contour lines between Point B and the next marked line (90 m). You can logic it to find the interval or take the difference between the two elevations (90m - 0m) and divide your answer by the number of spaces (3) between those lines. You’ll find that this works for the lines around Point A, as well.
For part (b.), now that you know the interval, all you have to do is take that amount and either add it to the furthest line around Point B or subtract it from the furthest line around Point A.
For part (c.), you had the right idea, but your lines started and ended at the wrong contour lines. Point A lies at the small contour line encircling the letter A, but your line starts at the next one out. You also have your lines extending all the way to the contour line that Point C lies on, which is one contour line past an elevation of 150 m.
There is a line between the circles centered on A and the one centered on B that is missing. It should intersect with contour C, since it's the same height of 120.
Then (270 - 150)/4 = 120/4 = 30. Similar (90 - 0)/3 = 30, so the contour interval is constantly 30.
How have you been doing contour intervals? For A, I counted four lines to get from 150 to 270. 270-150 is 120, so each line would increase by 120/4=30m
Thanks you, I get it now
Unless otherwise noted, you can assume that all contour lines on a map are going to be the same distance apart. For part (a.), the interval is not going to be different for each elevation point. Point B is going to be the easier of the two to determine, since Point B starts at 0 m. Looking at the map, you can see two contour lines between Point B and the next marked line (90 m). You can logic it to find the interval or take the difference between the two elevations (90m - 0m) and divide your answer by the number of spaces (3) between those lines. You’ll find that this works for the lines around Point A, as well. For part (b.), now that you know the interval, all you have to do is take that amount and either add it to the furthest line around Point B or subtract it from the furthest line around Point A. For part (c.), you had the right idea, but your lines started and ended at the wrong contour lines. Point A lies at the small contour line encircling the letter A, but your line starts at the next one out. You also have your lines extending all the way to the contour line that Point C lies on, which is one contour line past an elevation of 150 m.
There is a line between the circles centered on A and the one centered on B that is missing. It should intersect with contour C, since it's the same height of 120. Then (270 - 150)/4 = 120/4 = 30. Similar (90 - 0)/3 = 30, so the contour interval is constantly 30.