Pake cara ya :) Ps.kalo gak mau jawab gausah comment yg gk jelas

Luas = Ltrapesium + Lppjg

Ltrapesium = (s.atas + s.bawah) x t/2
= (13 + 21) x 3 /2
= 34 x 3/2
= 51 cm^2

Lppjg = p x l
= 21 x 5
= 105 cm^2

Lgabung = 51 + 105 = 156 cm^2 (c.)

L1 = ( a + b) : 2 × t
= ( 13 + 21 ) : 2 × 3
= 34 : 2 × 3
= 102 : 2
= 51 cm

L2 = P × t
= 21 × 5
= 105 cm

L gabungan :

105 + 51 = C. 156 cm²