The rhombus is a shape formed by 4 straight lines. It has two sides that are parallel but the other 2 are not. That is to say, all 4 angles are right angles, and all 4 sides are equal in length. The square is a type of rectangle, but also a type of rhombus. A square with one-inch sides is smaller than a square with three-inch sides because one is less than three. A square’s four sides are all the same length. The SquareĪ square has four sides, but not just any four sides. The distinguishing characteristic of a rectangle is that all 4 angles measure 90 degrees. A rectangle has two equal sides of one length and two equal sides of a different length. The rectangle is a shape that has 4 sides. Scalene Triangle: no 2 sides are of equal measure.(An equilateral triangle is also isosceles.) Isosceles Triangle: it has 2 (or more) sides that are of equal length.Equilateral Triangle: all 3 sides are the same length.Obtuse Triangle: the largest of the 3 angles is an obtuse angle (more than 90 degrees).Acute Triangle: the largest of the 3 angles is an acute angle (less than 90 degrees).Right triangle: the largest of the 3 angles is a right angle.There are different ways of classifying triangles, according to their sides or angles.

The triangle is a shape that is formed by 3 straight lines that are called sides. The distance around a circle is called the circumference of the circle. The circle is a shape that can be made by tracing a curve that is always the same distance from a point that we call the center. Another type of plane shape is known as a quadrilateral, or a 2-dimensional shape with 4 straight sides that is closed and has no open sides. Polygons are plain figures or shapes made up of lines. Many plane shapes are polygons, or any 2-dimensional shape with straight sides or lines that is closed and has no open sides. Plane shapes have properties including sides, corners, and faces. A plane shape has length and breadth, but no thickness. Plane shapes in mathematics are any closed, flat, 2-dimensional shapes. Back to: Mathematics Primary 5 HELLO, WELCOME BACK TO CLASS

Plane shapes examples