Hitunglah keliling dan luas lingkaran,jika: a. jari-jarinya 49 m b. diameternya 10 cm c. jari-jarinya 10,5 m

#Keliling
a. 2 x π x r
= 2 x 22/7 x 49
= 11 × 7
= 77m = 770 cm
b. π x d
= 3,14 x 10
= 31,4 cm
c. 2 x π x r
= 2 x 3,14 x 10,5
= 6,28 x 10,5
= 65,94
#luas
a. π x r²
= 22/7 x 49 x 49
= 22 × 7
= 154 × 49
= 7546m = 75460cm
b. π x r²
= 3,14 x 10 x 10
= 314cm
c. π x r²
= 3,14 x 10,5 x 10,5
= 346,185cm