From the diagram you can see that
AB=10,
KB=5,
BT=4.
Since AB=AK+KB, you have that 10=AK+5, AK=10-5=5. This means that AK=KB=5 and K is the midpoint of AB (1st option is correct). Also KB=5, BT=4, then B is not the midpoint of KT (2nd option is not true) and KB≠BT.
AK=KB and KB≠BT, then AK≠BT (3rd option is false).
AB=10 and KT=KB+BT=5+4=9, then AB≠KT (4th option is false).
Answer: true is 1st statement.
