Mac OS Measuring distance between two points

Diagram, use of the transparent radial distance scale.

Using the transparent radial distance scale (Costa Rica political and physical maps)
Press the mouse button Press mouse button. when the cursor is over the bar at the top of the scale or the arrow icon and while keeping the button pressed, drag the scale over the map. Release the mouse button when the center is over the starting point or the destination. You can now measure the streight line distance between two points. The illsutration shows that the streight line distance between Quepos and Jaco is 50 kms.

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