Q.21: Let C1 and C2 be concentric circles such that the diameter of C1 is 2cm longer than that of C2. If a chord of C1 has length 6 cm and is a tangent to C2, then the diameter, in cm of C1 is
Correct Answer: 10
The line from the center bisects chohrd of length 6
into 3 and 3. Since the triangle is of 3, r and r +1
Triplet of triangle 3,4 and 5
r = 4, r + 1 = 5 (radius of C1)
Diameter of C1 = 10
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