Two of the angles in a triangle measure 90° and 81°. What is the measure of the third angle?

To find the measure of the third angle in a triangle, we can use the fact that the sum of all angles in a triangle is always 180°.

Here are the steps:

1. Add the measures of the two known angles:

( 90° + 81° = 171° )

2. Subtract this sum from 180° to find the third angle:

( 180° – 171° = 9° )

So, the measure of the third angle is 9°.

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