Respuesta :

Equating

5 x - 10 = 90 ( right angle )

5 x = 90 + 10

5 x = 100

Divide both sides, we have:

x = 100/5

x = 20

For ST,

put x = 20 in x -5 ,

20 - 5 = 15

KT = 2 X 15 = 30 cm

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