Luas bangun ABCD adalah... a. 348 cm² b. 408 cm² c. 435 cm² d. 510 cm²

Mapel Math
Bab Kesebangunan

Penyelesaian :
Sisi atas
= 9 cm + 20 cm + 9 cm
= 38 cm

Luas trapesium ABCD
= 1/2 × ( a + b ) × t
= 1/2 × ( 20 cm + 38 cm ) × 12 cm
= 58 cm × 6 cm
= 348 cm^2
Opsi => A

Good Luck

Bangun Datar

Trapesiun ! 
Luas = 1/2 x (a + c) x t

c = 20cm
t = 12 cm
a = 38 cm

L = 1/2 (a + c) t
L = 1/2 (38 + 20) 12
L = 1/2 (58)12
L = 1/2(696)
L = 348 cm²