Question

What is the perimeter of a triangle with coordinates A (-1, 5), B (-1, 1), and C (2, 1)?

A. 12 units
B. 6 units
C. 24 units
D. 20 units
Helppp

Answer 1

Vertex coordinates: A[-1; 5] B[-1; 1] C[2; 1]
Centroid: CG[0; 2.333]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[-0; 1]

Exterior (or external, outer) angles of the triangle:
∠ A' = α' = 143.13° = 143°7'48″ = 0.644 rad
∠ B' = β' = 90° = 1.571 rad
∠ C' = γ' = 126.87° = 126°52'12″ = 0.927 rad