Question

Va rog!!! Pana la ora 11:00!!!!​

Answer 1

AD=12

AD+BD+AB=48

BD+AB=36

AB=36-BD

AB²=AD²+BD²

AB²=144+BD²

1296-72BD+BD²=144+BD²

1152=72BD

BD=16 cm

AB=20 cm

A=BD×AD=16×12=192cm²

DE+EB+DB=38,4

DE+EB=22,4

Aplicam teorema catetei

AD²=AE×AB

144=AE×20

AE=7,2

BE=20-7,2=12,8 cm

DE=22,4-12,8=9,6 cm

$A_{DEBC}=\frac{(BE+DC)\times DE}{2} =\frac{32,8\times 9,6}{2} =157,44 cm^2$