kak no.6 tolong ya!!!

L=1/2.a/t=1/2.8.10=40cm2

Luas segitiga ABD
= 1/2 x alas x tinggi
= 1/2 x (8 +4) x 10
= 1/2 x 12 x 10
= 6 x 10
= 60 cm ^2

Luas segitiga ACD
= 1/2 x 4 x 10
= 20 cm^2

Luas segitiga BCD
= (60 - 20) cm^2
= 40 cm^2