tolong isi ya!! aku mohon

ac = 12 be = 8 de : be = 4 : 8
luas = 1/2 x 12 x 12 = 72

a) AC=2×AE=2×6=12 cm
b) BE=√(10²-6²)=√64=8 cm
c) DE=12-8=4 cm
DE : BE = 4 : 8 = 1 : 2
d) Luas = ½×AC×BD=½×12×12=72 cm²