here "B-C-D" means ( it is not B minus C minus D) - Maths - Arithmetic Progressions

Question

here "B-C-D" means??? ( it is not B minus C minus D)

Jayesh Sharma · Accepted Answer

BCD refers to a line segment BD at which AC is perpendicular on it

here "B-C-D" means??? ( it is not B minus C minus D).