Question

A system of symbols used to represent special things is called –
(A) Angle (B) Degree (C) Notation (D) Shape

Answer 1

Hint: A symbol is a mark, sign, or word that indicates; or is understood as representing an idea, object, or relationship. So here we are representing a system of symbols that represent some special things, let's talk about each of the options below.

Complete step by step solution:
Angle – In geometry, an angle can be defined or the figure formed by two rays meeting at a common endpoint. An Angle represented by the Symbol $\angle $. Angles are measured in degrees.
Degree – A degree is a measurement of plane angle, defined so that a full rotation is 360 degrees.
Because a full rotation equals 360 degrees usually denoted by '0'. Ex.- ${90^\circ },{120^\circ }$
Notation – A notation is a writing system used for recording concepts. The notation user symbols or system of symbols that are intended to have a precise semantic meaning.
Ex.- A system of symbols,
$\Delta ABC = \Delta PQR$
Where $'\Delta '$ is a symbol is the notation. Here it is referred to as a ‘triangle’.
Shape – A shape is the form of an object or its external boundary, outline or external surface.
So as per the previous discussion, the correct answer is (C).

Note:- there are a huge no of notations which we are using in mathematics. Mathematical notations are used in mathematics, physical science, engineering and economics. The notation uses symbols or symbolic expression.