hailey1420 hailey1420
  • 23-04-2017
  • Mathematics
contestada

Help me please find the value of x on the diagram

Help me please find the value of x on the diagram class=

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Sxerks Sxerks
  • 23-04-2017
Theorem: If a tangent and a secant meet at an external point, then the product of the length of the secant and its external segment is equal to the square length of the tangent.

If we put this into practice in this question, then it becomes:
x² = 7(21 + 7)
x² = 7 · 28
x² = 196
x = 14, because x > 0

Thus, the length of x is 14 (D)
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