21. cd = df, e bisects df, and cd = 14.2. find ef

answer: 1, 3 and 5 are correct

step-by-step explanation:

mathpapa

step-by-step explanation:

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the circumference of a circle is, 10.676 cm.

step-by-step explanation:

the formula for circumference of a circle is given by:

where

c is the circumference of a circle and

d is the diameter of a circle.

given: diameter(d) = 3.4 cm and use

substitute these values in [1] we get;

cm

therefore, the circumference of a circle is, 10.676 cm