which can be decomposed into two triangles
Answer (1)
A quadrilateral (any 4-sided polygon) can be decomposed into two triangles by drawing one diagonal between opposite vertices. This holds true for trapezoids, kites, parallelograms, squares, and rectangles. The interior angles of a quadrilateral add up to 360° (two triangles × 180°) because a diagonal divides the form into two non-overlapping triangles. Try it: triangles ABC and ADC will appear when you connect vertex A to the opposing vertex C.
