perhatikan gambar dibawah ini,jika panjang jati-jari 7 cm. keliling bangun yg di arsir adalah

a. 44 cm

K=2.phi.r
= 2 × 22/7 × 7
=44 cm


semoga membantu;)

Keliling 1 = Keliling 1/2 lingkaran
K1 = 1/2×2×(TI)× r = 1/2×2×22/7×7
= (1×2×22×7) / (2×7) cm = 1×22 cm
= 22cm
Keliling 2
= k persegi pjg - k 2×(1/4) ingkaran
= (14+7+14+7) - 2×(1/4)×(2×TI×r)
= 42 cm - 2×(1/4)×2×(22/7)×7 cm
= 42 cm - (2×2×22×7) / (4×7) cm
= 42 cm - 22 cm = 20 cm

Keliling arsir = K1+K2 = 22 cm + 20 cm
= 42 cm
(Jawab. B)