???????????????????????
Answers
Answer:
Solution to your 6th Question
Step-by-step explanation:
Given Questions:-
6) A rectangular play ground measuring 120 m by 80 m has a 3 m side walking track around it.Find the area of the walking track?
7) A round digital wrist watch has a rectangular display inside it. Find the area around the digital display.if the length and breadth of the rectangular display is 7 cm and 5 cm respectively,and the diameter of the watch is
12 cm?
Solutions:-
6) Measurements of the rectangular play ground are 120 m and 80 m
Length of the play ground (l)=120 m
Breadth of the play ground (b)=80 m
Area of the rectangular play ground="lb" sq.units
=>120×80 sq.m
=>9600 sq.m
Area of the rectangular play ground=9600 sq.m
If the walking track around inside it then
Width of the track=3 m
Length of the inner play ground=120-2(3)
=>120-6=114 m
Breadth of the inner play ground=80-2(3)
=>80-6=74 m
Area of the inner play ground=
=>114×74 sq.m
Area of the inner play ground=8436 sq.m
Area of the walking track=Area of the total
play ground- Area of the inner play ground
=>9600-8436 sq.m
=>1164 sq.m
Answer:-
Area of the walking track=1164 sq.m
__________________________________
7)Diameter of the wrist watch=12 cm
Radius of the wrist watch=Diameter/2
=>Radius=12/2=6 cm
Area of the circle =πr² sq.units
Area of the wrist watch=π(6)² sq.cm
=>(22/7)×36 sq.cm
=>(22×36)/7 sq.cm
=>792/7 sq.cm
=>113.14 sq.cm
Area of the wrist watch=113.14 sq.cm
Length of the rectangular digital display=7 cm
Breadth of the rectangular digital display=5 cm
Area of a rectangle=lb sq.units
Area of the rectangular digital display
=7×5=35 sq.m
Area around the digital diplay =
Area of the wrist watch - Area of the rectangular digital display
=>112.14-35 sq.cm
=>77.14 sq.cm
Answer:-
Area around the digital display=77.14 sq.cm