Jari jari suatu lingkaran adalah 20 cm.tentukanlah.luas juring lingkaran yang dibentuk oleh sudut pusat sebagai berikut.
a.30 derajat
b.45 derajat
c.60 derajat
d.50 derajat
e.120 derajat
a.30 derajat
b.45 derajat
c.60 derajat
d.50 derajat
e.120 derajat
ImmanuelSinaga
![\displaystyle \frac{\text{Sudut pusat}}{360'}=\frac{\text{Luas juring}}{{\text{Luas lingkaran}}} \\ \\ a.\frac{30}{360}\times[3,14 \times 20~cm \times 20~cm] ~~~~~~~~\boxed{=104,67,33~cm^2}\\ \\ b.\frac{45}{360}\times[3,14 \times 20~cm \times 20~cm]~~~~~~~~\boxed{=157~cm^2} \\ \\ c.\frac{60}{360}\times[3,14 \times 20~cm \times 20~cm]~~~~~~~~\boxed{=209,33~cm^2} \\ \\](https://tex.z-dn.net/?f=%5Cdisplaystyle+%5Cfrac%7B%5Ctext%7BSudut+pusat%7D%7D%7B360%27%7D%3D%5Cfrac%7B%5Ctext%7BLuas+juring%7D%7D%7B%7B%5Ctext%7BLuas+lingkaran%7D%7D%7D+%5C%5C+%5C%5C+a.%5Cfrac%7B30%7D%7B360%7D%5Ctimes%5B3%2C14+%5Ctimes+20%7Ecm+%5Ctimes+20%7Ecm%5D+%7E%7E%7E%7E%7E%7E%7E%7E%5Cboxed%7B%3D104%2C67%2C33%7Ecm%5E2%7D%5C%5C+%5C%5C+b.%5Cfrac%7B45%7D%7B360%7D%5Ctimes%5B3%2C14+%5Ctimes+20%7Ecm+%5Ctimes+20%7Ecm%5D%7E%7E%7E%7E%7E%7E%7E%7E%5Cboxed%7B%3D157%7Ecm%5E2%7D+%5C%5C+%5C%5C+c.%5Cfrac%7B60%7D%7B360%7D%5Ctimes%5B3%2C14+%5Ctimes+20%7Ecm+%5Ctimes+20%7Ecm%5D%7E%7E%7E%7E%7E%7E%7E%7E%5Cboxed%7B%3D209%2C33%7Ecm%5E2%7D+%5C%5C+%5C%5C+ "\displaystyle \frac{\text{Sudut pusat}}{360'}=\frac{\text{Luas juring}}{{\text{Luas lingkaran}}} \\ \\ a.\frac{30}{360}\times[3,14 \times 20~cm \times 20~cm] ~~~~~~~~\boxed{=104,67,33~cm^2}\\ \\ b.\frac{45}{360}\times[3,14 \times 20~cm \times 20~cm]~~~~~~~~\boxed{=157~cm^2} \\ \\ c.\frac{60}{360}\times[3,14 \times 20~cm \times 20~cm]~~~~~~~~\boxed{=209,33~cm^2} \\ \\")
![d.\frac{50}{360}\times[3,14 \times 20~cm \times 20~cm]~~~~~~~~\boxed{=174,44~cm^2} \\ \\ e.\frac{120}{360}\times[3,14 \times 20~cm \times 20~cm]~~~~~~~~\boxed{=418,67~cm^2}](https://tex.z-dn.net/?f=d.%5Cfrac%7B50%7D%7B360%7D%5Ctimes%5B3%2C14+%5Ctimes+20%7Ecm+%5Ctimes+20%7Ecm%5D%7E%7E%7E%7E%7E%7E%7E%7E%5Cboxed%7B%3D174%2C44%7Ecm%5E2%7D+%5C%5C+%5C%5C+e.%5Cfrac%7B120%7D%7B360%7D%5Ctimes%5B3%2C14+%5Ctimes+20%7Ecm+%5Ctimes+20%7Ecm%5D%7E%7E%7E%7E%7E%7E%7E%7E%5Cboxed%7B%3D418%2C67%7Ecm%5E2%7D "d.\frac{50}{360}\times[3,14 \times 20~cm \times 20~cm]~~~~~~~~\boxed{=174,44~cm^2} \\ \\ e.\frac{120}{360}\times[3,14 \times 20~cm \times 20~cm]~~~~~~~~\boxed{=418,67~cm^2}")
6 votes
Thanks 20
Andi951753
/45 drajat