Luas bangun ABCDE adalah..

BD = [tex] \sqrt{25^{2} - 15^{2} } \\ \sqrt{625 - 225} \\ \sqrt{400} [/tex]
BD = 20 cm

Luas segitiga = 1/2 x a x t
Luas segitiga = 1/2 x 20 x 15
Luas segitiga = 10 x 15
Luas segitiga = 150 cm

ED = 14 + [tex] \sqrt {20^{2} - 16^{2}} \\ \sqrt{400 - 256} \\ \sqrt{144} [/tex]
ED = 14 + 12
ED = 26

Luas trapesium = (a + b) x t / 2
Luas trapesium = (26 + 14) x 16 / 2
Luas trapesium = 40 x 8
Luas trapesium = 320 cm

Luas ABCDE = 150 + 320 cm
Luas ABCDE = 470 cm

BD = √25^2 - √15^2 = √625-√225=√400=12
√20^2 - √16^2 = √400- √256 = √144= 12
ED= 14+12 = 26
Luas ABDE = [(26+14)×16]÷2 = 320cm^2
Luas CBD= (15×20) ÷ 2 = 150cm^2
Luas ABCDE = 320+150 = 470 cm^2