Question

what is the measurement of this angle?

Explanation:

Step1: Determine the scale reading

The inner scale of the protractor is used. The angle is measured from \(0^{\circ}\) to the terminal side.
The terminal side is at \(70^{\circ}\) and the initial side (the reference line) is at \(90^{\circ}\).

Step2: Calculate the angle measure

We use the formula for angle measurement with a protractor. The measure of the angle \(\theta=90 - 70\).

Answer:

\(20\)