Question

2. The floor of a building consists of 1,000
rhombus-shaped tiles. The diagonals of each tile
are 40 cm and 20 cm in length. Find the total cost
of polishing the floor if the cost per sq metre is Rs 10 ​

Answer 1

Area of rhombus= (diagonal 1)(diagonal 2) / 2

$area = \frac{0.4 \times 0.2}{2} \\ area = 0.04 {m}^{2}$

Area of 1000 such tiles= 0.04 × 1000

$40 {m}^{2}$

Cost per square metre= rs. 10

Cost of 40 metre square is

$40 \times 10 = rs \:400$