![]() ![]() Lateral edges – The edges through the vertex of a pyramid are known as its lateral edges. In other words, The length of the perpendicular drawn from the vertex of a pyramid to its base is called the height of the pyramid.Īxis – The axis of a pyramid is a straight line joining the vertex to the central point of the base. Height – The height of a pyramid is the length of the perpendicular from the vertex to the base. Vertex – The common vertex of the triangular faces of a pyramid is called the vertex of the pyramid. An ice-cream cone is an example of a coneīelow we have a general diagram of a Cone A cone is called a right circular cone if the line from its vertex to the centre of the base is perpendicular to the base. In other words, it is an extension of a square in a 3D plane.īelow we have a general diagram of a cubeĪ cube has 6 rectangular faces, out of which all are identical.Ī cylinder is a solid with two congruent circles joined by a curved surface.īelow we have a general diagram of a CylinderĪ cylinder has one curved surface and two flat faces.Ī circular cone has a circular base that is connected by a curved surface to its vertex. Examples of a cube are sugar cubes, cheese cubes and ice cubes. In other words, it is an extension of a rectangle in a 3D plane.īelow we have a general diagram of a cuboidĪ cuboid has 6 rectangular faces, out of which the opposite sides are identical.Ī cuboid whose length, breadth and height are equal is called a cube. Let us now understand some of the common 3D shapes –Ī 3D shape having six rectangular faces is called a cuboid. Vertices – The meeting point of a pair of sides of a polygon is called its vertex. It is similar to the sides we have in 2D shapes. Some common terms used to define the 3D shapes are –įaces – A face refers to any single flat surface of a 3D shape.Įdges – An edge is a line segment on the boundary joining one vertex (corner point) to another. Let us understand some of these shapes in detail. The room of a house is a common example of a 3 d shape. 3 – Dimensional Shapesģ Dimensional shapes or 3D shapes are the shapes that have all three dimensions, i.e. When the two radii form a 180 o or half the circle, the sector is called a semicircle and has a major arc.Ī rhombus is a quadrilateral with four equal sides. ![]() When the central angle formed by the two radii is 90 o, the sector is called a quadrant because the total circle comprises four quadrants or fourths. Acute central angles will always produce minor arcs and small sectors. Following is an example of concentric circles –Īrc of a Circle: An arc of a circle is referred to as a curve that is a part or portion of its circumference. The ratio of the circumference of a circle and its diameter is always constant.Ĭoncentric Circles – Circles having the same centre but with different radii are said to be concentric circles. ![]() It has no dimensions.Ĭircular Region – The part of the circle that consists of the circle and its interior is called the circular region.Ĭhord of a Circle – A line segment joining any two points on a circle is called a chord of the circle.Ĭircumference of a Circle – The perimeter of a circle is called the circumference of the circle. How about organising all the important terms in geometry in one place? Let us list down some important terms and definitions in geometryīelow is the list containing some important terms and definitions in geometry along with their graphical representations – Point and LinesĪ point is an exact location in space. Due to its vast coverage, there are so many terms in geometry that often we need to refer to various books for the same. We get to learn about a lot many things in geometry such as lines, angles, transformations, symmetries and similarities. In other words, Geometry is the study of different types of shapes, figures and sizes in Maths or real life. Geometry is the branch of mathematics that deals with shapes, angles, dimensions and sizes of a variety of things we see in everyday life. ![]()
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