Respuesta :

Circumference = 2 x pi x radius

RADIUS 4                         RADIUS 5
C= 2 x pi x 4                   C = 2 x pi x 5
Both have 2 pi in them, so factor out leaving 4:5 still
The ratio of the radius of two circles is 4:5

C = 2
πr

first circle
C = 8
π

second circle
C = 10
π

answer
ratio of radius 4:5, ratio of 
circumferences 8π: 10π
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