bAntu yah... tolong banget

...
50+15+15+10+(1/2.3,14.40).
90+62,8.
= 152,8 cm. B.

sukses terus

keliling persegi panjang = 50 + 15 + 15 + 10 = 90 cm
keliling 1/2 lingkaran = 1/2 x π x (50-10) = 1/2 x π x 40 = 62,8 cm
total keliling = 90 + 62,8 = 152, 8 cm (B)