abigailbaafi
abigailbaafi abigailbaafi
  • 28-07-2020
  • Mathematics
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What is the length of JM in the given figure?

What is the length of JM in the given figure class=

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tramserran
tramserran tramserran
  • 28-07-2020

Answer:  B. 30

Step-by-step explanation:

When given a secant and a tangent, the formula is:

exterior of secant × secant = tangent²

                     KM   ×    JK     =    LK²

                      10   ×  (JM + 10) = 20²

                            10JM + 100 = 400

                                     10JM = 300

                                         JM =  30

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