Tentukan keliling dan luas lingkaran dari a)r=9cm b)d=34cm c)d=10cm

A) r= 9cm d=18cm
K = phi x d
K = 3,14 x 18
K = 56,52 cm

L = phi x r x r
L = 3,14 x 9 x 9
L =254,34cm²

b) d= 34 cm r = 17cm
K = phi x d
K = 3,14 x 34
K = 106,76cm

L = phi x r x r
L = 3,14 x 17 x 17
L = 907,46cm²

3) d=10cm r=5cm
K = phi x d
K = 3,14 x 10
K = 31,4cm

L = phi x r x r
L = 3,14 x 5 x 5
L = 78,5cm²