Question

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

Explanation:

Step1: Recall the sum of angles in a triangle

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

Step2: Identify the known angles

One angle is \(90^{\circ}\) (right - angle) and another is \(40^{\circ}\).

Step3: Calculate angle \(y\)

Using the formula \(y = 180^{\circ}-90^{\circ}-40^{\circ}\).

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Answer:

\(50^{\circ}\) (the third option)