the dimensions of a room are 10 m × 8 m × 5 m. If there is a door of height 2.8 m and width 0.75 m and two windows, each of dimension 1.2 m ×1.2 m, what is the area of the four walls alone without the area of door and windows ? What is the area of the ceiling ?
Answers
Answer:
Area of the four walls without the area of door and windows = 175.02 m²
Area of the celling = 80 m²
Step-by-step explanation:
Given,
For room,
Length, l = 10 m
Breadth, b = 8 m
Height, h = 5 m
Height of the door = 2.8 m
Width of the door = 0.75 m
Area of the door = height×width
= 2.8×0.75
= 2.1 m²
Length of window = 1.2 m
Breadth of window = 1.2 m
Number of window = 2
Area of two windows = 2×1.2×1.2
= 2.88 m²
Area of the four walls = 2h(l+b)
= 2×5(10+8)
= 180 m²
Required area of the four walls = 180-(area of the door+area of windows)
= 180-(2.1+2.88)
= 175.02 m²
Area of the celling = l×b
= 10×8
= 80 m²