Hitung lah luas dari lingkaran berikut!
Jawab:
a. r = 21
= phi x r xr
l=22/7 x 21 x 21
=22x 3 x 21
=66x 21
=1,386
c=r= 36
l= 3.14 x 36 x 36
= 4,069.44
e. d = 84
r = 84 : 2 =42
l=22/7 x 42 x 42
=22 x 6 x 42
=5,544
b.r 20
l=3,14 x 20 x 20
= 31,4 x 2 x 20
=1,256
d = 56
r = 56 : 2 =28
l = 22/7 x 28 x 28
= 22 x 4 x 28
=3,136
f : d = 60
r = 60: 2 = 30
l= 3.14 x 30 x 30
= 31,4 x 3 x 30
=94.2 x 30
=2,826
Penjelasan dengan langkah-langkah: