I found on google play with this application that is really good, you can make conversion of all units of measure such as mass, area, volume, speed and others. And there are many units of all measurement systems
The section geometry can calculate area of geometric figures such as rectangle, circle, trapezium, polygons and more, also you can calculate the volume of regular solids such as spheres, cylinders, cones, polyhedrons.
It is a very complete application, there is the link of google play. Oh and I forgot it's totally free.
download GOOGLE PLAY
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