11.2 Cuboids and Cubes

Step 1

Identify dimensions: $l = 1.5$ m, $b = 1.25$ m. Height $h = 65$ cm = $0.65$ m (Unit consistency is key!).

Step 2

Since it is open at the top, we need the LSA + Area of Bottom base.

Step 3

Area = $2h(l+b) + lb$ .

Step 4

$2(0.65)(1.5 + 1.25) + (1.5 \times 1.25)$ .

Step 5

$1.3(2.75) + 1.875 = 3.575 + 1.875 = 5.45 \text{ m}^2$ .

Step 6

Cost = Area $\times$ Rate = $5.45 \times 20$ .

Final Answer

Area: 5.45 m², Cost: ₹109

Select Shape

Radius (r)

Height (h)

Results