Question

The length of a rectangular block is 6.75 m and breadth is 1.75 m. The perimeter of the block is :
(a) 17.00 m
(b) 17.0 m
(c) 17 m
(d) 17.00 m​

Answer 1

the perminter of the block of lenght 6.75 and breadth 1.75 is 17 m

Answer 2

The length of a rectangular block is 6.75 m and breadth is 1.75 m.

The perimeter of the block is ...

solution : perimeter of rectangular block = 2(length + breadth)

= 2(6.75 + 1.75)

= 17 m

but here you should apply significant figures concepts.

significant figures of addition/subtraction :

1. find lowest number of decimal places
2. this lowest number of decimal places determines how many decimal places will appear in the answer.

here lowest number of decimal places = 2 ( you see 6.75 , 1.75 both has 2 digits after decimal)

so the answer must be consider 2 digits after decimal.

therefore the perimeter of rectangular block is 17.00 m