The little squares in each corner mean 'right angle'Ī rectangle is a four-sided shape where every angle is a right angle (90°).Īlso opposite sides are parallel and of equal length. The SquareĪ square has equal sides (marked 's') and every angle is a right angle (90°)Ī square also fits the definition of a rectangle (all angles are 90°), and a rhombus (all sides are equal length).

The RhombusĪ rhombus is a four-sided shape where all sides have equal length (marked 's').Īlso opposite sides are parallel and opposite angles are equal.Īnother interesting thing is that the diagonals (dashed lines) meet in the middle at a right angle. In other words they 'bisect' (cut in half) each other at right angles.Ī rhombus is sometimes called a rhomb or a diamond. NOTE: Squares, Rectangles and Rhombuses are allĪ trapezoid (called a trapezium in the UK) has a pair of opposite sides parallel.Īnd a trapezium (called a trapezoid in the UK) is a quadrilateral with NO parallel sides: Also opposite anglesĪre equal (angles 'A' are the same, and angles 'B' The ParallelogramĪ parallelogram has opposite sides parallel and equal in length. (the US and UK definitions are swapped over!)Īn Isosceles trapezoid, as shown above, has left and right sides of equal length that join to the base at equal angles. one of the diagonals bisects (cuts equally in half) the other.the diagonals, shown as dashed lines above, meet at.The KiteĮach pair is made of two equal-length sides that join up. and that's it for the special quadrilaterals. The only regular (all sides equal and all angles equal) quadrilateral is a square. So all other quadrilaterals are irregular.A triangle is a 3 -sided polygon with 3 edges and 3 vertices in geometry. Interior angles sum equals 180 degrees is the feature of a triangle. The angle sum property of a triangle is the name for this property. If EFG is a triangle, it is written as EFG, with E, F, and G as the triangle’s vertices. In Euclidean geometry, a triangle is a two-dimensional form made up of three non-collinear points in a single plane. TriangleĪ triangle is a closed 2-D polygon with 3 sides and a total angle of 180 degrees. Obtuse Triangle : An obtuse-angled triangle or obtuse triangle is one in which one of the triangle’s angles is more than 90 degrees.Right angle triangle :-A right-angled triangle or right triangle is formed when one of the triangle’s angles is 90 degrees.Acute Triangle: An acute-angled triangle or acute triangle is formed when all of the angles of a triangle are acute, that is, they measure less than 90 degrees.The following are the different sorts of triangles based on angles: There are various type of triangle are given below: Types of triangle based on angle. Isosceles Right Triangle: An isosceles right triangle is a triangle with two equal sides and one 90° angle.Equilateral or Equiangular Triangle : An equilateral or equiangular triangle is one in which all sides and angles are equal.The following are the different sorts of triangles, as well as their sides and angles: Types of triangle on the basis of the sides and angles.

Triangles are categorized into the following types based on their side lengths: Acute Scalene Triangle: An acute scalene triangle is a triangle with three unequal sides and three acute angles.Obtuse Scalene Triangle: An obtuse scalene triangle is a triangle with an obtuse angle and sides of varying lengths.A right scalene triangle is defined as a triangle in which any one of the angles is a right angle and all three sides are unequal.Īcute Isosceles Triangle: An acute isosceles triangle is one with all three angles being acute and two sides measuring the same length.Obtuse Isosceles Triangle: An obtuse isosceles triangle is defined as a triangle with two equal sides and one obtuse angle.Two sides and two acute angles are equivalent in an isosceles right triangle.

Obtuse isosceles triangle degrees