Question

if a rectangular door those length 1.8m and breadth 90 cm find its perimeter and area

Answer 1

given that,
length of a rectangular door = 1.8 m
breadth of a rectangular door= 90cm= 9/10 m
perimeter = 2(l + b)
= 2( 1.8 + 9/10)
= 5.4 m
and,
area= l× b
= 1.8 × 9/10
= 1.62 sq. m

Answer 2

$area = 1.8 \times .9 \\ = 1.62m \: square \\ perimeter = 2 (1.8 + .9) \\ = 2 \times 2.7 \\ = 5.4meter$