tolong kerjain nomor 28 pake cara...

EF = 2×(8-6) = 4 cm

Luas diarsir
= 1/2 × 20 × 16 - 1/2 × 20 × 4
= 1/2 × 20 × (16 - 4)
= 120 cm2

Jawab B

Luas layang-layang = d1 x d2 x 1/2
 - 16 cm x 20 cm x 1/2 =160 cm2
 - (16 cm - 6 cm - 6cm) x 20 cm x 1/2 
   = 4 cm x 20 cm x 1/2 = 40 cm2

= 160 cm2 - 40 cm2 = 120 cm2 (b)