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AP² = 10² - 6²
AP² = 100-64
AP² = 36
AP = 6
Luas layang layang OAPB = 2.ΔOAP
Luas layang layang OAPB = 2.(1/2.a.t)
Luas layang layang OAPB = 2.(1/2.6.6)
Luas layang layang OAPB = 2.18
Luas layang layang OAPB = 36
luas layang layang OAPB = 1/2.AB.OP
36 = 1/2.AB.10
36 = 5.AB
AB = 36/5
AB = 7.2 cm