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2x+5x= 28
7x= 28
x= 4
BO= 2x = 2(4)= 8cm
OD=5x = 5(4)= 20cm
A. Panjang diagonal AC
AO=6 (karena tripel pythagoras dengan 8 dan 10)
AC= 2.AO
= 12cm
B. Luas layang-layang
1/2.12.28= 168cm^2