Answer:
A
General Formulas and Concepts:
Geometry
- Sum of Angles in a shape: 180(n - 2)
- All angles in a triangle add up to 180°
Step-by-step explanation:
The interior angles of a triangle will always add up to 180°.
A triangle has 3 sides: n = 3
180(3 - 2)
180(1)
180°
