Tolong pake cara. please

Luas I Trapesium = 1/2 x (a+b) x t
                            = 1/2 x (20+12) x 13
                            = 1/2 x 32 x 13
                            = 208 cm²

Luas II Persegi Panjang = p x l
                                      = 20 x 5
                                      = 100 cm²

Luas bangun seluruhnya : 208 + 100 = 308 cm² =3,08 m²