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AD²=BD×DC
AD²=4X9
AD²=36
AD=6
36/26 = 60/60-(x+5)
36/26 = 60/60-x-5
36/26 = 60/55-x
36(55-x) = 26 x 60
1980 - 36x = 1560
-36x = 1560 - 1980
= -420
36x = 420
x = 420/36
= 11,66 cm
gambar 3
AD2 = BD x BC
= 4 x (13-4)
= 4 x 9
= 36
AD = akar pangkat 2 dari 36 = 6cm