tolong dijawab dong please

=21×16:2=168cm2
maaf kalau salah

Luas Layang-layang = diagonal 1 x diagonal 2 x 1/2
                                 = (8 cm + 8 cm) x (15 cm + 6 cm) x 1/2
                                 = 16 cm x 21 cm x 1/2 = 168 cm2