tolong dijawab yg benar. Mencari luas gabungan!!

L trapesium = 1/2 x (a+b) x t
=1/2 x ((20+20)+20)x20
=1/2 x 60 x 20
=30 x 20
= 600 cm
L segitiga =1/2 a x t
=1/2 (20+20) x 46
=1/2 40 x 46
=20 x 46
=920
L gabungan = 600 + 920
=1520