Question

1. what is the sum of angles in a triangle? 90° 180° 270° 360° other: 2. in a right - angled triangle, if one angle is 30°, the other non - right angle is: 30° 45° 60° 90°

Explanation:

Step1: Recall angle - sum property

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

Step2: Solve for second question

In a right - angled triangle, one angle is 90°. Given another angle is 30°. Let the third angle be $x$. Using the angle - sum property of a triangle ($90^{\circ}+30^{\circ}+x = 180^{\circ}$), we can solve for $x$ as $x=180^{\circ}-(90^{\circ} + 30^{\circ})=60^{\circ}$.

Answer:

1. B. 180°
2. C. 60°