![]() ![]() ![]() A diameter divides a circle into two semicircles. Semicircle: Half of a circle is semicircle. Each part is a semicircle.Arc: A part between any two points on a circle is an arc.Circumference: The length of the circle is the circumference of the circle.The diameter is the longest chord which passes through the centre. AB is a chord of the circle. Chord: Any line segment with its endpoints on the boundary of the circle is a chord.Diameter: A line segment with both of its endpoints on the boundary of the circle and passes through the centre is the diameter of the circle. AB is the diameter of the circle. Diameter = 2 × Radius.Radius: The line segment with one endpoint at the centre and the other on the boundary of the circle is a radius of the circle. OA is the radius of the circle.Centre: The fixed point of the circle which is equidistance from all the points on the circle is its centre. Point O is the centre of the circle.When a set of points is at the same distance from a fixed point the figure obtained is a circle. The sum of the angles is 720°.Ī polygon with seven sides is a heptagon. The sum of the interior angles of a pentagon is 540°. ABCDE is a regular pentagon with all equal sides. Its diagonals bisect each other at right angle. KiteĪ quadrilateral in which two pairs of adjacent sides are equal is a kite. The diagonals bisect each other at right angles.Ī quadrilateral in which only one pair of opposite sides is parallel is a trapezium.Both the diagonals are equal in length and bisect each other at right angles.Ī parallelogram in which all the four sides are equal in length is a rhombus.Both the diagonals are equal in length and bisect each other.Ī parallelogram with all sides of the same length and all the angles of 90° is a square.The sides of a quadrilateral that have no common endpoint are opposite sides.Ī rectangle is a special case of a parallelogram. ParallelogramĪ quadrilateral in which the pairs of opposite sides are parallel is a parallelogram. There are various types of the quadrilateral. A quadrilateral has four sides, four vertices, and four angles. Equiangular Triangle: If all the three angles are equal, the triangle is an equiangular triangle.Ī closed figure bounded by four line segments is known as a quadrilateral.Obtuse-angled Triangle: An obtuse-angled triangle is the one in which one of the angles is obtuse.Right-angled Triangle: A right-angled triangle is the one in which one of the angles is a right angle (90°).Acute-angled Triangle: A triangle in which each angle is acute (less than 90°) is an acute-angled triangle.On the basis of the measure of angles, triangles are of following types: Scalene Triangle: A scalene triangle is the one with all unequal sides.Isosceles Triangle: A triangle with two sides of equal length is an isosceles triangle.Equilateral Triangle: A triangle with all sides equal is an equilateral triangle.On the basis of equality of sides, triangles are of three types: The sum of the interior angle of a triangle is 180°. TrianglesĪ polygon bounded by three line segments or sides is a triangle. Let us discuss the types of polygons on the basis of the number of sides. A Polygon in which all sides and all angles are not equal is an irregular polygon. The sum of all interior angles of a regular polygon = 180° × (n − 2), where n is the number of sides. A Polygon in which all sides and all angles are equal is a regular polygon. Polygons are classified into Regular and Irregular Polygons. Adjacent Vertices: The end-points of the same side of a polygon are adjacent vertices.Vertex: The point where the sides of a polygon meet is called the vertex of the polygon.Adjacent Sides: Two sides of a polygon having a common end-point are adjacent to each other.Sides: The lines segments that form the exterior of the polygon are the sides of the polygons.PolygonsĪ polygon is a simple closed figure with three or more than three line segments. Shapes can be classified into curves ( circles) and polygons. Every object around us has a definite shape. The shapes are made of lines or line segments arranged in an organized manner. Let us learn more about the closed figure. Browse more Topics under Shapes And Angles ![]() The figures that start and end at the same point are closed figures. Open figures are those which do not end where they start. Figures can be broadly classified as open or closed. A figure can be made of different types of shapes. What is shape? The literal meaning of shape is the external form of a thing or its appearance. ![]()
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