Hitunglah keliling daerah yang di arsir!

a)
K 3/4 lingkaran
= 3/4 × 2 Π r
= 3/2 × Π r
= 3/2 × 22/7 × 7
= 3/2 × 22
= 66/2
= 33 cm

b)
K 1/2 lingkaran
= 1/2 × 2 Π r
= Π r
= 3,14 × 5
= 15,7 cm

c)
K persegi panjang
= 2 × ( p + l )
= 2 × ( 21 + 7 )
= 2 × 28
= 56 cm

K 1/2 lingkaran
= 1/2 × 2 Π r
= Π r
= 22/7 × 7
= 22 cm

K daerah yang diarsir
= 56 cm - 22 cm
= 34 cm

Semoga membantu