Question

find the missing angle. a triangle is shown with two angles labeled 13° and 29°, and the third angle labeled x°. below are four options: 138 (orange), 29 (blue), 13 (green), 42 (red).

Explanation:

Step1: Recall triangle angle sum

The sum of angles in a triangle is $180^\circ$.

Step2: Calculate the sum of known angles

Add the two given angles: $13^\circ + 29^\circ = 42^\circ$.

Step3: Find the missing angle

Subtract the sum of known angles from $180^\circ$: $x = 180^\circ - 42^\circ = 138^\circ$.

Answer:

138