Keliling trapesium abcd adalah... cm Tolong pake cara!

20+20+40+28/30
108/110
A.110 cm

BE = 41 - 20 = 21 cm
BC²= 20² + 21²
BC²= 400 + 441
BC = √841 = 29 cm
Keliling = AB + BC + CD + AD
            = 41 + 29 + 20 + 20
            = 110 cm