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10-1.Circle and System of Circles
hard
माना $C _{1}$ तथा $C _{2}$ क्रमशः वृत्तों $x ^{2}+ y ^{2}-2 x -2 y -2=0$ तथा $x ^{2}+ y ^{2}-6 x -6 y +14=0$ के केन्द्र हैं। यदि $P$ तथा $Q$ इन वृत्तों के प्रतिच्छेदन बिन्दु हैं, तो चतुर्भुज $PC _{1} QC _{2}$ का क्षेत्रफल (वर्ग इकाई में) है
A
$8$
B
$6$
C
$9$
D
$4$
(JEE MAIN-2019)
Solution

Since circles are orthogonal and have equal radii therefore the quadirlateral $P{Q_1}Q{C_2}$ is aspuare.
Hence area $ = 2 \times 2 = 4$sp. units.
Since circles are orthogonal and have equal radii therefore the quadrilateral $P{C_1}Q{C_2}$ is a spuare.
Hence area $ = 2 \times 2 = 4$ sq. units.
Standard 11
Mathematics