Tolong kak klo bisa pakai cara yak​

~Matematika

9.) 44cm

10.) 1,1 km

11.) 198cm

12.) 77cm

13.) 1.389cm²

14.) 154cm²

15.) 28

Penjelasan dan langkah-langkah terlampir yaa…..

1.π x d

= (22/7) x 14

= 22 x 2

= 44 cm.

2.panjang lintasan

= keliling x banyak putaran

= 220 cm x 500

= 110.000 cm

= 1,1 km.

3.Jarak = Keliling x Frekuensi putaran

Keliling=Jarak /Frekuensi putaran

= 1980 m/1000 kali

= 1,98 m

= 198 cm

Keliling=2πr

2.22/7.r=198

44/7.r=198

r=198/(44/7)

r=198x(7/44)

r=31,5 cm

D=2r

=2×31,5

=63 cm

———

catatan:

1,98 km=1980m.

4.→ K = 484 cm

→ r = ….. ?

K = 2πr

484 = 2 × 22/7 × r

484 = 44/7 × r

r = (484 × 7) / 44

r = 77 cm

5.Luas Lingkaran

= 1/4 πd²

= 1/4 x 22/7 x 42²

= 22/28 x 1764

= 22 x 63

= 1.386 cm.

6.π x r x r

22/7× r ×r

22/7×7×7

=157cm²

7.L = 1.232 cm²

L = 1/2 x π x r²

1.232 = 1/2 x 22/7 x r²

1.232 x 2 x 7 = 22 x r²

17.248 = 22 x r²

r² = 17.248 : 22

r² = 784

r = √784

r = 28 cm.

Semoga membantu maaf kalau salah.