Yok bantuin yoooook;)

Yok bantuin yoooook;)

Jawab:

5) Jarak yang ditempuh roda = n x keliling roda

= 100 x 2 x 3,14 x 25

= 15700 cm

= 157 m (C)

6) Jari-jari = d/2 = 40/2 = 20cm

Luas lingkaran = π $r^{2}$

= 3,14 x 20 x 20

= 1256 cm2 (D)

7) Luas lingkaran = π $r^{2}$

314 = 3,14 $r^{2}$

314/3,14 = $r^{2}$

$r^{2}$ = 100

r = 10 cm

Keliling = 2 x 3,14 x 10 = 62,8 (B)

8) Luas arsir = Luas setengah lingkaran besar – 2 (luas setengah lingkaran kecil)

= 1/2 (π $r^{2}$ ) – 2(1/2π $r^{2}$ )

= 1/2 (3,14.14.14) – 2(1/2. 3,14. 7. 7)

=1/2 (615,44) – 153,86

= 307,72- 153,86

= 153.86

~ 154 cm2