Question

EXERCISE 14.1
1. Find the perimeter and area of the following rectangles:
(a) length = 12 cm, breadth = 8 cm
(b) length=20 m, breadth = 15m
1:1​

Answer 1

Answer :

Step by step explanation :

For part a ,

Area = Length × Breadth

• 12 × 8
• 96 cm²

Perimeter = 2 ( length + breadth )

• 2 ( 12 + 8 )
• 2 × 20
• 40 cm

For part b ,

Area = Length × Breadth

• 20 × 15
• 300 cm²

Perimeter = 2 ( length + breadth )

• 2 ( 20 + 15 )
• 2 × 35
• 70 cm

Answer 2

Step-by-step explanation:

$\huge \underbrace \red{answer}$

a).

• Length = 12 cm.
• Breadth = 8 cm.

$perimeter \: of \: rectangle \to \: 2(l + b)$

• 2( 12 + 8 ) = 2 × 20 = 40cm.

$area \: of \: rectangle \to \: l \times b$

• 12 × 8 = 96 cm ^2.

b).

• Length = 20 m.
• Breadth = 15m.

✯ Perimeter = 2 ( 20 + 15)

= 2 × 35 = 70m.

✯ Area = l × b = 20 × 15 = 300m^2 .

( see formula above ) .

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