An angle of $90^\circ$ is called a right angle.
The meaning of right angle is $90^\circ$, if any angle is $90^\circ$, the angle is called a right angle.
Right angle is denoted by a symbol $∟$ in mathematics.
Right angle is formed in two different types in geometric system.
Any angle of a line is generally measured from zero degrees line. If any line is exactly $90^\circ$ to the surface of the earth, the angle made by the line is called a right angle.
$\overrightarrow{RS}$ is a ray and it is initially parallel to the surface of the earth. In other words, it is at zero angle.
The ray $\overrightarrow{RS}$ is rotated an angle of $90^\circ$ in anticlockwise direction to reach its final position where the ray $\overrightarrow{RS}$ is known as $\overrightarrow{RT}$.
The angle made by the ray $\overrightarrow{RS}$ from its initial position to final position is $90^\circ$ and it is denoted by $\angle TRS$.
$\angle TRS = 90^\circ$
The angle $TRS$ is exactly $90^\circ$. Therefore, the angle is called a right angle.
The angle between any two straight lines is measured geometrically by considering one line as baseline to another line and vice-versa to measure the angle. If the angle between them is $90^\circ$, the two lines are perpendicular to each other and the angle made between them is called a right angle.
$\overrightarrow{UV}$ and $\overrightarrow{UW}$ are two rays and they both are started from a point $U$ but they continued travelling perpendicular to each other.
So, the angle between $\overrightarrow{UV}$ and $\overrightarrow{UW}$ is $90^\circ$ and the angle between them is denoted by $\angle VUW$.
$\angle VUW = 90^\circ$
The angle $VUW$ is $90^\circ$, therefore the angle between rays $\overrightarrow{UV}$ and $\overrightarrow{UW}$ is called a right angle.
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