The Total solution for NCERT class 6-12
Perimeter of figure (a) = 4 × side = 4 × 60 = 240 mPerimeter of figure (b) = 2 [l + b]Perimeter of figure (b) = Perimeter of figure (a)2[l + b] = 240⇒ 2 [80+ b] = 240⇒ 80 + b= 120⇒ b =120 – 80 = 40 mArea of figure (a) = (side)2 =60 × 60 = 3600 m2Area of figure (b) = l × b = 80 × 40 = 3200 m2So, area of figure (a) is longer than the area of figure (b).