Equations of four circles are (x±5)2+(y±5)2=25. Then which of the following is (are) CORRECT?
A
The minimum radius of the circle touching all the four circles is 5(√2−1)
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
The maximum radius of circle touching all the four circles is 5(√2+1)
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
Area of region enclosed by all the four circles is 100−25πsq. unit
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
The centres of four circles are the vertices of a rectangle
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct options are A The minimum radius of the circle touching all the four circles is 5(√2−1)
B The maximum radius of circle touching all the four circles is 5(√2+1)
C Area of region enclosed by all the four circles is 100−25πsq. unit
D The centres of four circles are the vertices of a rectangle
There are two circles that touch all the four circles as shown in diagram. In ΔAOE, OA=√52+52=5√2 ∴ Radius of smaller circle =5√2−5=5(√2−1) Radius of larger circle =5√2+5=5(√2+1)
Area enclosed by circles =102−4(π×524) =100−25πsq. unit