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∠ ABC = (360° - ∠ BAD - ∠ BCD) : 2
= (360° - 68° - 82°) : 2
= 210° : 2
= 105°
9) 1/2 keliling jajar genjang = keliling Δ sama sisi
= 3 x 93
= 279
keliling jajar genjang = 279 x 2
= 558 cm
17) L.ABCD = s²
324 = s²
s = √324
s = 18 cm
DP = PQ = QC = 18/3
= 6cm
DS = 18 - 6
= 12 sm
L.persegi : L.diarsir = s x s : : (L.ABCD - L.BCQR - L.STPD
= 324 : (324 - 6x 18 - 12 x 6)
= 324 : 144
= 9 : 4