times~{3}~=~540^\circ\) The number of triangles in each polygon is two less than the number of sides. The formula for calculating the sum of interior angles is: \(({n}~-~{2})~\times~180^\circ ...

ADA: These properties tell us it’s a polygon.A polygon is a closed ... learning on the names of shapes and their properties, such as number of sides and angles. You could check pupils ...