The two concentric circles have radii of 17 cm and 15 cm. What is the length (in cm) of the chord, of the bigger circle, which is a tangent to the smaller circle?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 16.
We know that,
Length of chord = 2 × √(R2 - r2)
⇒ 2 × √(172 - 152)
⇒ 2 × √(289 - 225)
⇒ 2 × √64
⇒ 2 × 8
⇒ 16
Thus, the length of the chord is 8 cm