Luas bangun datar di samping adalah ... a. 204 cm# b. 226 cm 11 cm 244 cm? d. 246 cm? 20 cm

Langsung aja ya

DB^2 = 17^2 - 8^2 = 289-64 = 225
DB^2 = 225 = 15^2
DB = 15 cm

AE^2 = 15^2 - (20-11)^2 = 225 - 81 = 144
AE^2 = 144 = 12^2
AE = 12 cm

LUAS = 1/2 × DC × DB + (AB+DE)×AE/2
= 1/2 × 8 × 15 + (11+20)×12/2
= 4×15 + 31 × 6
= 60 + 186
= 246 cm^2

JWB. E

L = Luas ABDE + Luas BCD

Luas BCD:
BD = √BC² - CD²
BD = √17² - 8²
BD = √289 - 64
BD = √225
BD = 15 cm

L = ½ × a × t
L = ½ × 8 × 15
L = 60 cm²

Luas ABDE:
t = √15² - (20 - 11)²
t = √225 - 81
t = √144
t = 12 cm

L = (a + b) × t / 2
L = (11 + 20) × 12 / 2
L = 186 cm²

L = 60 + 186
L = 246 cm² (D)