Tolong dijawab yang nomor 5

a. Keliling ○
= pi×D
= 22/7 × 14
= 22×2 = 44cm

Keliling[] - Keliling ○
=(28+14+28+14) - 44
=84-44 = 40cm

b. Keliling set○
=pi×D /2
=22/7 × 21 /2
=22×3 /2
=66/2 = 33cm

Keliling□+Keliling○
=(21+21+21)+33
=63+33= 96cm

c. Kelilung set○
=pi×D /2
=3.14×10 /2
=31.4 /2= 15.7cm

Keliling set○
=pi×D /2
=3.14×20 /2
=62.8/2= 31.4cm

Keliling seluruh
=31.4-15.7+15.7
=31.4cm

Maaf kalau ada yg salah;)