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Find the perimeter of a rectangle in which:(i) length $=$ 16.8cm and breadth $=$ 6.2cm(ii) length $=$2m25cm and breadth $=$ 1m50cm(iii) length $=$ 8m5dm and breadth $=$6m8dm.
Given :
The given dimensions of the triangles are
(i) length $=$ 16.8cm and breadth $=$ 6.2cm
(ii) length $=$2m25cm and breadth $=$ 1m50cm
(iii) length $=$ 8m5dm and breadth $=$6m8dm.
To do :
We have to find the perimeter of the triangles.
Solution :
We know that,
For a rectangle of length l and breadth b,
- $Area = l \times h$
- $Perimeter = 2(l+b)$
$1 m = 100 cm$ and $1 dm = 10 cm$
(i) length $=$ 16.8 cm and breadth $=$ 6.2 cm
Perimeter $= 2(16.8+6.2) cm = 2(23) cm = 46 cm$.
Therefore, the perimeter of the triangle is 46 cm.
(ii) length $= 2 m 25 cm = (200+25) cm = 225 cm$ and breadth $= 1 m 50 cm = (100+50) cm = 150cm$
Perimeter $= 2(225+150) cm = 2(375) cm = 750 cm = 7m 50 cm$.
Therefore, the perimeter of the triangle is 7 m 50 cm.
(iii) length $= 8 m 5 dm = (800+50) cm = 850 cm$ and breadth $= 6 m 8 dm = (600+80) cm = 680cm$
Perimeter $= 2(850+680) cm = 2(1530) cm = 3060 cm = 3000 cm + 60 cm = 30m + 6 dm = 30m 6dm$.
Therefore, the perimeter of the triangle is 30 m 6 dm.