The names of polygons are derived from the prefixes of ancient Greek numbers. One with one obtuse angle and two acute angles is called obtuse (obtuse-angled), and one with a right angle is known as right-angled.Įach of these will also be either equilateral, isosceles or scalene. The internal angles of a triangle always add up to 180°.Ī triangle with only acute internal angles is called an acute (or acute-angled) triangle. Triangles can also be described in terms of their internal angles (see our page on Angles for more about naming angles). Scalene – all three sides, and all three internal angles, are different.Isosceles – has two equal sides, with the third one a different length.Equilateral – all the sides are equal lengths, and all the internal angles are 60°.There are several different types of triangle (see diagram), including: Three-Sided Polygons: TrianglesĪ three-sided polygon is a triangle. Polygons are usually defined by the number of sides that they have. The angles between the sides of the shape.Diagonals of the rhombus bisect each other while diagonals of the rhombus intersect at the same ratio.When working with polygons the main properties which are important are:.Diagonals of the rhombus intersect each other at right angles while diagonals of the trapezoid are not necessarily perpendicular to each other.The triangles formed by the diagonals of the trapezoid are not necessarily congruent. Any diagonal of the rhombus separates the rhombus into two congruent triangles.Only the legs of the trapezoid can be equal. Trapezoid has unequal sides in general, with two sides parallel to each other. Rhombus has equal sides, with opposing sides parallel to each other.Each shape has four sides, and diamond shape refers to a rhombus. Rhombus and Trapezoid are well-defined mathematical objects while diamond shape is a layman’s term.What is the difference between Diamond, Rhombus and Trapezoid? ![]() Read the Difference Between Parallelogram and Trapezoid If a and b are bases and c,d are legs, the lengths of the diagonals are given byĪrea of the trapezoid can be calculated using the following formula.The two diagonals of the trapezium intersect at the same ratio (ratio between the section of the diagonals are equal).If the adjacent angles are not on the same base of the trapezoid, they are supplementary angles.The parallel sides of the trapezoid are known as the bases and the other two sides are called the legs.įollowing are main characteristics of trapezoids Trapezoid is a convex quadrilateral where at least two sides are parallel and unequal in length. The diagonals bisect the two opposite internal angles.Īrea of the rhombus can be calculated using the following formula.Each diagonal divides the quadrilateral into two congruent triangles. ![]()
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