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25. keliling 1/2 lingkaran= 1/2×π×d
=1/2×3,14×20
=31,4cm
keliling trapesium
=20+35+25
=80cm

31,4+ 80=111,4cm <c>


26.keliling lingkaran=2×π×r
=2× 22/7 × 21
=132cm × 150
=19.800 cm=198m <d>