dari gambar tersebut,tentukan: a.keliling bangun tersebut, b.luas daerah yang di arsir.

a.Ktotal=K1+K2+K3
=1/2×2×phi×R+2×1/2×phi×1/2×R
=phi×R+1/2phi×R
=
[tex] = \frac{3}{2} \pi \: r[/tex]

b. Ltotal=L1-L2-L3

[tex] = \frac{1}{2} \pi {r}^{2} - 2 \times \frac{1}{2} \pi( { \frac{1}{2} r)}^{2} = \frac{1}{4} \pi {r}^{2} [/tex]