Geometry notation: what does $m\angle ABC$ mean?

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I see in some math formulation that a certain angle is called, let's say

$$\angle ABC$$

but there is a letter put in front of the angle notation.

$$m\angle ABC$$

What does the $m$ represent here? A factor?

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3 Answers

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$\angle ABC$ : The angle ABC

$m\angle ABC$: The measure of $\angle ABC$

So, when $\angle ABC \cong \angle DFG$ , that means, $m\angle ABC = m\angle DFG$

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The notation $m\angle ABC$ typically denotes "the measure of angle $ABC$."

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∠ABC refers to the physical angle itself while m∠ABC refers to its measure. There isn't any difference between these two and it is absolutely correct to use any of them...Some people just want to formalize things; these people think-"I have a car that is priced at 50000dollars, so i am driving a car and not 50000dollars" and so want to differentiate between little everything.

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