Interior angles in a triangle add up to 180˚. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to a ...

Choose a polygon, and reshape it by dragging the vertices to new locations. As the figure changes shape, the angle measures will automatically update. Animation: For triangles and quadrilaterals, you ...

Abstract: The abstract nature of mathematics contributes to the low understanding of students' mathematical concepts. For this reason, it is recommended that educators use mathematical software which ...