Question

20° f = x =

Explanation:

Step1: Recall triangle - angle - sum property

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

Step2: Analyze the given triangle

We know one angle is 90° (right - angle) and another non - labeled angle is equal to the 20° angle (due to the property of isosceles triangle, as two sides are equal).

Step3: Calculate angle F

$F=180^{\circ}-90^{\circ}-20^{\circ}=70^{\circ}$

Answer:

$F = 70^{\circ}$