tolong di jawab ya,dari tadi jawaban gue selalu 132 gada pilihannya.

Luas ∆ABC = 1/2 . 8 . (6 + 4) = 4 (10) = 40 cm^2
Luas ∆ABD = 1/2 . 8 . (6 + 4 + 5) = 4(15) = 60 cm^2
Luas ∆ABE = 1/2 . 8 . 4 = 16 cm^2

Luas ∆ACE = luas ∆ABC - luas ∆ABE = 40 - 16 = 24 cm^2
Luas ∆BED = luas ∆ABD - luas ∆ABE = 60 - 16 = 44 cm^2
Luas yang tidak diarsir = luas ∆ACE + luas ∆BED
= 24 + 44
= 68 cm^2

Luas yang tidak diarsir =
(1/2.a×t) + (1/2.a×t) + (1/2.a×t) + 4/2 =
(1/2.8.[{6+5+4}2]) + (1/2.8.[{6+4}/2]) + ( 1/2.8×4) 2 =
4.7,5 + 4.5 + 16 + 2 =
30 + 20 + 18 =
68cm^2 ( A )