Given: Radius of circles r1= 15 cm r2= 17 cm Property of tangent - A tangent is perpendicular to the center of the circle. Property of chord - A perpendicular line drawn from the center of the circle to the chord of the circle always divide the chord in half. 
Applying the property of chord and tangent: We find that- 172 = 152+(x/2)2 289 = 225 +x2 /4 289 – 225 =x2 /4 x2 =256 x=16 Therefore, length of the chord = 16 cm.
(4.89)2 + √144.35 - √121.25 = ?
30.02% of 420.11 + 44.96% of 499.96 - 203.12 = ?
√675 + √785 = ? × 8.995
66.05 × 17.95 – 38.99 × 18.12 = (60 + ?) × 6
30.22% of (79.9 x 6.01) + 69.97 =?
17.98% of (16.93 X 8.992 + 46.87) = ? of 14.92 - 26.83 of 1.98
12.03 x 4.21 +19.95% of 300.05 ?
(29.892 × √290) + 32.98 × 6.91 = ?
(3/8) × 479.84 + (2/5) × 449.67 = ? × 12.25
(?)2 = (5.99)2 + (7.88)2 + 43.99
