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= 2 ( (9)(7) + (9)(T) + (7)(T) )
= 2 ( 63 + 9T + 7T)
= 2 (63 + 16T)
= 126 + 32T
126 + 32T = 254
32T = 254 - 126
32T = 128
T = 128 / 32
T = 4 cm