↔️⚫

#diameter line #filled circle #circle geometry #line through circle #center line

↕️⚪️

#diameter #circle #height #measure #across vertically #line through circle

⚪️↔️

#diameter #circle #width #measure #across #line through circle

⭕️╱

#divided circle #circle slash #graphic slash #visual division #box drawing slash #line through circle