Question

a triangle has a 80° angle and a right angle. what is the measure of the third angle?

Explanation:

Step1: Recall angle - sum property of a triangle

The sum of the interior angles of a triangle is 180°.

Step2: Identify given angles

One angle is 80° and another is a right - angle (90°).

Step3: Calculate the third angle

Let the third angle be \(x\). Then \(x+80 + 90=180\), so \(x=180-(80 + 90)\).
\(x = 180 - 170=10\).

Answer:

10°