susah tolong bantu boss....

Diagonal 1= 23+8=31 cm
Diagonal 2=9+9=18 cm
Luas=½×31×18=279 cm²
Jawaban:
B)279 cm²

Diagonal1=23+8=31
Diagonal2=9+9=18
Luas layang layang=1/2×D1×D2
=1/2×31×18
=31×9
=279 opsi B

Semoga bermanfaat