First get any shape and divide it by triangles. For example, a hexagon has six sides, you divided by 4 triangles. You know that a triangle measures 180 degrees, so you add all the triangle by 180 degrees and you give the answer.
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A protractor is used to measure angles.
The answer depends on what information you have about the shapes.
Surface area of shapes can be measured in square centimetres
You measure or calculate the area. How you do that will depend on the shapes involved.
Mainly to draw or measure angles of lines or shapes on paper.