Question
Suppose triangle ABC has vertices at A(1, 0), B(10, 0), and C(2, 6). After a 60° counterclockwise rotation about the origin, vertex B' has coordinates (5, ?).
Answers
oobleck
recall that
x' = x cosθ - y sinθ
y' = x sinθ + y cosθ
x' = x cosθ - y sinθ
y' = x sinθ + y cosθ