Question

Tolong dijawab beserta caranya nomor 10

Answer 1

L=1,54
=3,14×1,54×1,54
= 3,14×2.3716
=7.446824

Answer 2

Luas lingkaran = π × r × r
1,54 = 22/7 × r × r
1078 = 2200 r^2 -->[dikali silang]
r^2 = 1078/2200 = 0,49
r = √0,49 = 0,7 cm
jadi, diameternya adalah 2 × r = 2 × 0,7 = 1,4 cm