Question

12. If the length and breadth of a rectangle are 42 cm and 34 cm respectively. Find its perimeter.​

Answer 1

Answer:

Perimeter of rectangle =40 cm (given)

condition :- length = 2× breadth +2

⇒l=2b+2

perimeter p=2(l+b)=40

⇒2(2b+2+b)=40

⇒2(3b+2)=40

⇒6b=40−4=36

∴b=6cm

l=2×6+2=12+2=14cm

∴ length =14 cm, breadth =6 cm

Answer 2

Answer:

152 cm

Step-by-step explanation:

Length = 42 cm

Breadth = 34 cm

∴ Perimeter= 2(l + b)

                   = 2 (42 + 34)

                   = 2 (76)

                   = 152 cm

Hence, the perimeter of the rectangle is 152cm.