Question

1. what is the measure of angle y? 90° 130° 50° 40°

Explanation:

Step1: Recall the sum of angles in a triangle

The sum of the interior angles of a triangle is \(180^{\circ}\).

Step2: Substitute the known angles

Let the right - angle be \(90^{\circ}\), one angle is \(40^{\circ}\), and the third angle is \(y\). Then \(90^{\circ}+40^{\circ}+y = 180^{\circ}\).

Step3: Solve for \(y\)

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Answer:

\(50^{\circ}\) (corresponding to the option \(50^{\circ}\))