Question

2. Find the perimeter of the following.

a. A square with side 21 cm.

b. A rectangle with length 8.9 m, breadth 4.6 m.

plz give the answer in method......​

Answer 1

Answer:

a)84cm^2

b)27cm^2

Step-by-step explanation:

a) perimeter of squre=4a

=4×21

=84cm^2

b) perimeter of rectangle=2×(l+b)

=2(8.9+4.6)

=2(13.5)

=27cm^2

Answer 2

Step-by-step explanation:

Solution 1:

$\implies$ $\sf{ P = 4×s}$

$\implies$ $\sf{4 × 21 }$

$\therefore$ Perimeter = $\boxed{\sf{ 84cm}}$

$\implies$ $\sf{P= 2(l+b) }$

$\implies$ $\sf{ 2(8.9 + 4.6}$

$\implies$ $\sf{2(13.5) }$

$\implies$ $\sf{ 27cm}$