Advertisements
Advertisements
Question
The walls and ceiling of a room are to be plastered. The length, breadth and height of the room are 4.5 m, 3 m, and 350 cm respectively. Find the cost of plastering at the rate of Rs 8 per m2.
Advertisements
Solution
Given,
Length of the room `(l)` = 4.5 m
Breadth of the room `(b)` = 3 m
Height of the room `(h)` = 350 cm = 3.5 m
And the cost of plastering = Rs 8 per m2
∴ Area of the walls = `2h(l + b)`
= 2 × 3.5 × (4.5 + 3)
= 7 × (7.5)
= 52.5 m2
Area of the ceiling = `lb`
= 4.5 × 3
= 13.5 m2
Area of the room = 52.5 + 13.5
= 66 m2
Hence, the cost of plastering = 66 × 8 = Rs 528
APPEARS IN
RELATED QUESTIONS
Lengths of the diagonals of a rhombus are 16.5 cm and 14.2 cm, find its area.
The diagonals of a rhombus are 18 cm and 24 cm. Find:
(i) its area ;
(ii) length of its sides.
(iii) its perimeter
Find the missing value.
| Diagonal (d1) | Diagonal (d2) | Area |
| 19 cm | 16 cm |
A sweet is in the shape of rhombus whose diagonals are given as 4 cm and 5 cm. The surface of the sweet should be covered by an aluminum foil. Find the cost of aluminum foil used for 400 such sweets at the rate of ₹ 7 per 100 sq.cm
The area of the rhombus with side 4 cm and height 3 cm is
The area of the rhombus when both diagonals measuring 8 cm is
The area of the rhombus is 576 sq.cm and the length of one of its diagonal is half of the length of the other diagonal then find the length of the diagonal
Area of a quadrilateral ABCD is 20 cm2 and perpendiculars on BD from opposite vertices are 1 cm and 1.5 cm. The length of BD is ______.
If the diagonals of a rhombus get doubled, then the area of the rhombus becomes ______ its original area.
