Direct instruction may help children to learn and more practice may enforce their learning. Therefore, a polygon, literally, is a figure with many angles. Triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon, undecagon, dodecagon and polygon are polygons with 3,4,5,6,7,8,9,10,11,12 and many sides . Triangles Equilateral triangle is a triangle in which the sides are equal in length. Right triangle is a triangle in which one of its angles is a right angle.
Equiangular triangle is a triangle whose three angles are congruent.
Acute triangle is a triangle in which all of its angles are acute angles. Obtuse triangle is a triangle in which one of its angle is obtuse angle. Students are asked to measure all angles of a triangle, and will find out the sum of the measures of the angles of a triangle is 180 o . Demo of constructing an isosceles triangle is directly to help children construct an isosceles triangle with compass. Quadrilaterals Square is a quadrilateral having four congruent sides and four angles of equal measure.