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Two circles C1 and C2 having the same radius of 2 cm and centres at P and Q respectively intersect each other such that the line of centres PQ intersects C1 and C2 at F and E respectively. EF = 1 cm. The whole assembly is enclosed in a rectangle of minimum area. The perimeter of rectangle is:
  • a)
    20 units
  • b)
    22 units
  • c)
    24 units
  • d)
    26 unit
  • e)
    28 units
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Two circles C1 and C2 having the same radius of 2 cm and centres at P...


Given Information:
- Radius of circles C1 and C2 = 2 cm
- EF = 1 cm

Solution:

Finding the Perimeter of the Rectangle:
To find the perimeter of the rectangle enclosing the circles, we need to consider the diameter of the circles. Since the line of centers PQ intersects both circles at points E and F, the line EF represents the diameter of the circles.

Finding the Diameter:
Since the radius of the circles is 2 cm, the diameter of the circles is 2 * 2 = 4 cm.
Given that EF = 1 cm, we can find the length of the line PQ using the Pythagorean theorem:
PQ^2 = EF^2 + (2 * 2)^2
PQ^2 = 1^2 + 4^2
PQ^2 = 1 + 16
PQ = √17 cm

Finding the Perimeter of the Rectangle:
The perimeter of the rectangle is twice the sum of the sides of the rectangle, which can be calculated as:
Perimeter = 2 * (2 * PQ + 2 * 2)
Perimeter = 2 * (2 * √17 + 4)
Perimeter = 2 * (2√17 + 4)
Perimeter = 4√17 + 8 ≈ 22 units

Therefore, the perimeter of the rectangle enclosing the circles is approximately 22 units, which corresponds to option B.
Free Test
Community Answer
Two circles C1 and C2 having the same radius of 2 cm and centres at P...
Length of rectangle = 2 x diameter = EF = 8 - 1 = 7
Breadth of rectangle = diameter = 4
So Perimeter = 2 x (7+4) = 22
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Two circles C1 and C2 having the same radius of 2 cm and centres at P and Q respectively intersect each other such that the line of centres PQ intersects C1 and C2 at F and E respectively. EF = 1 cm. The whole assembly is enclosed in a rectangle of minimum area. The perimeter of rectangle is:a)20 unitsb)22 unitsc)24 unitsd)26 unite)28 unitsCorrect answer is option 'B'. Can you explain this answer?
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