Practicing Success
In the figure, XYZ is a secant and ZT is a tangent to the circle at T. If TZ = 12 cm and YZ = 8 cm, then find the length of XY. |
8 cm 9 cm 6 cm 10 cm |
10 cm |
Concept Used If PAB is a secant to a circle intersecting it at A and B and PT is a tangent then PA x PB = \( {PT }^{ 2} \) Calculation By using the above concept ZX x XY = \( {ZT }^{ 2} \) ⇒ 8 x (YZ + XY) = \( {12 }^{ 2} \) ⇒ 8 x (8 + x) = 144 ⇒ 8 + x = 18 ⇒ x = 10 cm Therefore, x is 10 cm. |