Have a look inside the back of your sofa. Or can you remember where you used it last?
Alternatively, you could be more helpful in asking your question. Missing angle from what? What information is available?
The answer depends on which variable is missing.
butty mutt
180 minus two known angles = unknown angle
The total of the three interior angles in a triangle is 180 degrees. if you know two of the angles, subtract them from 180 and that gives you the third angle.
That will depend on the shape but if it's a triangle then the missing angle is 54 because there are 180 degrees in a triangle.
The answer depends on which variable is missing.
butty mutt
The answer depends on what information you do have!
To find missing angles in a kite, you can use the properties of kites: the angles between the unequal sides are equal, and the angles between the equal sides are also equal. Additionally, the sum of all interior angles in any quadrilateral is 360 degrees. By using the known angles and applying these properties, you can set up equations to solve for the missing angles.
All the angles of a square are 90 degrees.
The answer depends on what information you do have and what is missing. There is no single answer for all situations.
Subtract the two known angles from 180 degrees will give you the missing angle
180 minus two known angles = unknown angle
to find missing angles you are dealing with complementry and suplementry angles. Suplementry angles add up to 180 degrees so you must subtract what given angle you have from 180 and you come up with youre missing angle. This rule also gos for complementry but the angles must add up to 90 degrees
take away the interior angle adjacent to it from 360
you add the three other angles and subtract that from 360
To find a missing angle, you can use the properties of geometric shapes and relationships between angles. For example, in a triangle, the sum of all three angles is always 180 degrees, so you can subtract the known angles from 180 to find the missing angle. In other cases, you might use complementary angles (which sum to 90 degrees) or supplementary angles (which sum to 180 degrees) depending on the situation. Additionally, if the angles are part of parallel lines cut by a transversal, you can apply the corresponding angle or alternate interior angle theorems.