Updated Day 3 Perimeter guide combining basic perimeter calculation with missing measure skills. Includes 8 spacious pages for print: separate teacher scripts for each skill (Perimeter on Page 1, Missing Measures on Page 4), guided practice problems (one per page), and a 2-page STAAR-aligned exit ticket. Removed the "Rigor Tip" from the first script as requested. Optimized for maximum print clarity and zero content overflow.