Question

ch. 1 polygons: interior angles
triangle
number of sides:
sum of interior angles: °

Explanation:

Step1: Determine number of sides

A triangle has 3 sides.

Step2: Apply sum formula

Sum = (n-2)180°, n=3. So (3-2)180°=180°.

Answer:

Number of sides: 3
Sum of interior angles: 180°