IKMC 2027 - Grades 5-6 - Self-study SET 7 - Thematic Batch 3 Question 12

Peter has a rectangular poster measuring 80 cm by 50 cm. He accidentally tears part of it, then cuts a square of side 20 cm from each corner. What is the perimeter of the remaining shape?



Diagram convention: calculate the final outline shown; the tear is assumed to lie within the removed corner material.