Question

9. The floor of a hall consists of 3,000 tiles which are rhombus shaped and each of its diagonals are 45 cm and 30 cm in length. Find the total cost of polishing the floor, if the cost per m to the power 4 is 4rupees​

Answer 1

Step-by-step explanation:

1. area of rhombus = 1/2× d1× D2
2. where d1 and d2 are diagonals of rhombus
3. now area of rhombus = 1/2× 45× 30
4. area of rhombus= 675 cm^2

now area of 3000 tiles = 3000×675

so total area = 2025000 cm^2

now total area in square metres = 2025000/ 1000

so total area = 202.5 square metres

now cost of 1 sqare metres = rs 4

so cost of 202.5 square metres = 4×202.5

total cost = 810 rs