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Constructing a triangle without a protractor Place compass point at point P, and draw an arc using compass opened to 7 cm.

At the center of that push is land navigation, which tasks soldiers with plotting points on a map with a protractor and finding spots in the woods using a compass during both day and night.

Triangles and other shapes can be accurately constructed using a protractor, a pair of compasses and a ruler. Make an accurate drawing of a triangle with lengths 4 cm and 6 cm with an angle of 40 ...

"It's always good to know the basics of a map, compass and protractor - and how to use it," he said. "You can't always rely on computers.