Question

1. 28 cm.luas lingkaran di samping adalah...A 2.440 B.2.444 C.2.460 D 2.464
2.18 cm.luas lingkaran adalah a.101736 b.62036 c.25434 d.26434
3.8 dm/menit......cm/menit
A.4800 b.8000 c.80.000 d.84000
4.1.800 cm/menit.......cm/detik
A.30 B.45 C.60 D.75

Answer 1

Verified answer

1. 22/7x28x28=2464
2.3,14x18x18=1017,36
3.8x10=80
4.1800/60=30

Answer 2

1)L=phi×r×r
=22/7×28×28
=2462 cm2(D)
2)L=phi×r×r
=3,14×18×18
=1017,36(A)
3)8 dm/menit=8×10 cm
=80 cm/menit
4)1800cm/menit=1800/60 detik
=30 cm/detik(A)