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# The circumference of a circle varies directly as its diameter. if the circumference of a circle having a diameter of 7 cm is 7π cm, what is the circumference of the circle whose diameter is 10 cm? 15 cm? 18 cm? 20 cm? ​

• Réponse publiée par: nicole8678

10π cm, 15π cm, 18π cm, 20π cm

Step-by-step explanation:

C= πd

• Réponse publiée par: kambalpandesal23
EQUATION: C = kd

7 = k (7)

7/7 = k 7/7

1 = k

C = (1)(20)

C = 20

• Réponse publiée par: enrica11
Let C= circumference of the circle
d= diameter of the circle

(a) since c varies directly with d
C=kd

(b) Given C=7π and d=7, substituting it to the equation on (a) gives us:
(7π)=k(7)
k=7π/7
k=π

(c) to get the value of C we substitute d with values 10, 15, 18, 20 to the formula C=πd, therefore:

C=10π if d=10
C=15π if d=15
C=18π if d=18
C=20π if d=20
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The circumference of a circle varies directly as its diameter. if the circumference of a circle havi...