1
CHAPTER AT A GLANCE
Perimeter and Area
•Unit: Mensuration
•Board weightage: Perimeter of rectangle, square, triangle and regular polygons, area of rectangle and square, area of a triangle as half of a rectangle, combined figures and word problems give regular 1-mark, 2-mark, 3-mark and 4-mark questions in school examinations (please check your school's latest sample paper)
•Key ideas from the textbook: perimeter as the length of the boundary, formulas for rectangle, square, triangle and regular polygons, finding a missing side, area by squares, area of the remaining part, estimating area, triangle as half of a rectangle, same area with different perimeters
•Most scoring part: writing the formula first, substituting with units, and writing the unit (square units for area)
•Time to revise: about 60 minutes
1 of 8