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maka :
AD = BC
= akar dr 8²+6²
= akar dr 64+36
= √100
= 10 cm
jadi,
K.ABCD = 19+7+10+10 = 46 cm...(B)
= 64 + 36
= 100
AD = √100
= 10cm
Keliling ABCD = 19cm + 10cm + 7cm + 10cm
= 46cm ==> B
Jadi keliling trapesium ABCD tsb adalah 46cm