Definition:Grad

Definition

The grad is a measurement of plane angle.

It is defined as $\dfrac 1 {100}$ of a right angle.

\(\ds \)

\(\)

\(\ds 100\)

grads

\(\ds \)

\(=\)

\(\ds 90\)

degrees

Terminology

The grad is rarely used, so $\mathsf{Pr} \infty \mathsf{fWiki}$ is not going to go into great detail in this area.

A grad is divided into $100$ minutes, and each of those minutes is divided into $100$ seconds.

However, this nomenclature clashes with the usual names for minute of angle and second of angle, and so it is strongly recommended that they are not used.

Some sources refer to the centesimal minute as the centigrade, which clashes with another common usage of the word centigrade (although it is noted that that also is obsolete).

Also known as

Measurement in grads is also known as centesimal measure.

Some sources refer to the grad as a grade.

Also see

• Results about grads can be found here.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): angular measure
• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): grade: 1.
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): angular measure
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): grade: 1.