hitunglah keliling bangun di bawah ini

A) K=1/2×phi×d
=1/2×3,14×16
=1/2×50,24
=25,12 cm
B) K=1/4×phi×d
=1/4×3,14×8
=1/4×25,12
=6,28 cm
C) K persegi=9+9+9
=27 cm
K 1/2 lingkaran=1/2×phi×d
=1/2×3,14×9
=1/2×28,26
=14,13 cm
K persegi +K 1/2 lingkaran=27 cm+14,13=41,13 cm
D) K 1/2 lingkaran=1/2×phi×d
=1/2×3,14×12
=1/2×37,68
=18,84 cm
K persegi panjang=2×(p+l)
=2×(14+12)
=2×26
=52 cm-18,84
=33,16 cm
18,84 cm+33,16 cm=52 cm