1. Hitunglah luas segitiga ABC jika sisi b= 4 cm, sisi c= 6cm dan besar sudut A = 30° 2. Hitunglah luas jajaran genjang ABCD panjang AB = 10cm, BD= 8cm, Besa

1. L = 1/2 x b x c x sin A
L = 1/2 x 4 x 6 x sin 30°
L = 12 x 1/2
L = 6 cm^2

2. L jajar genjang = 2 x L.segitiga
= 2 x 1/2 x AB x BD x Sin ABD
= 2 x 1/2 x 10 x 8 x sin 30°
= 2 x 1/2 x 10 x 8 x 1/2
= 40 cm^2

1). Diketahui:
b = 4 cm
c = 6 cm
sinA = 30°

Pembahasan:
L = 1/2 x bc x sinA
L = 1/2 x (4)(6) x sin30°
L = 1/2 x 24 x 1/2
L = 6 cm²

2). Diketahui:
AB = 10 cm
BD = 8 cm
sinABD = 30°

Luas jajargenjang:
= 2 x 1/2 x AB x BD x sinABD
= 2 x 1/2 x 10 x 8 x sin30°
= 2 x 1/2 x 80 x 1/2
= 40 cm²