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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