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= ( 28 : 2 ) × 2
= 14 × 2
= 28 cm
Panjang AC
= 18 + 18
= 36 cm
Luas belah ketupat
= 1/2 × d1 × d2
= 1/2 × 36 cm × 28 cm
= 18 cm × 28 cm
= 504 cm2
Luas trapesium
= 1/2 × ( a + b ) × t
= 1/2 × ( 28 cm + 14 cm ) × 18 cm
= 42 cm × 9 cm
= 378 cm2
Luas gabungan
= 504 cm2 + 378 cm2
= 882 cm2
Option = B
i!Semoga membantu!i
1/2×D1×D2 + 1/2 ×(a+b)×t
1/2×36×28 + 1/2×(14+28)×18
18×28+21×18
18(18+21)
18×39= 882 (b)