Jangka
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Jangka adalah alat untuk menggambar lingkaran atau busur. Alat ini juga dapat digunakan untuk mengukur jarak, terutama pada peta. Kompas digunakan dalam matematika, gambar teknis, navigasi, dan lain-lain.
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Compasses are usually made of metal, and consist of two parts connected by a hinge which can be adjusted. Typically one part has a spike at its end, and the other part a pencil, or sometimes a pen. Circles can be made by fastening one leg of the compass into the paper with the spike, putting the pencil on the paper, and moving the pencil around while keeping the hinge on the same angle. The radius of the circle can be adjusted by changing the angle of the hinge.
Distances can be measured on a map using compasses with two spikes. The hinge is set in such a way that the distance between the spikes on the map represents a certain distance in reality, and by measuring how many times the compass fits between two points on the map the distance between those points can be calculated.