Please solve this sum and tell fast
Answers
Answer:
The answer is as follows:-
Step-by-step explanation:
The largest area of the circle is possible when,
diameter = 42
Therefore, radius = 42/2
= 21 cm
Therefore,
Area of circle = π(21) square
= 1386
Area of rectangle = (42×55)cm = 2310
Therefore, area of remaining cardboard = 42×55−π(21) square
= 2310−1386
= 924
Therefore, ratio of area of circle and arc of remaining cardboard = 1386:924
= 231:154
= 33:22
= 3:2
Answer:
4:3
Step-by-step explanation:
Rectangular Card-board
Length = 55 cm
Breadth = 42 cm
Circle
A circle of diameter 42 cm can be cut most largely.
.'. Radius = 21 cm
Area
Area of cardboard
= 55 × 42 cm^2
= 2310 cm^2
Area of circle
= π × (21)^2 cm^2
= 22/7 × 21 ×21 cm^2
= 22 × 3 × 21 cm^2
= 1320 cm^2
Area of remaining cardboard
= 2310 - 1320 cm^2
= 990 cm^2
Ratio
Ratio
= Area of circle cut / Area of remaining cardboard
= 1320 cm^2 / 990 cm^2
= 44/33
= 4/3
= 4:3 (Ans.)