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The perimeter of semi-circle is 3π cm.

Step-by-step explanation:

It is given that the perimeter of circle is, P = 2×π×r. The diagram in this question is semi-circle which is half of circle so you have to divide the 2 to the formula :

Circle,

P = 2×π×r

Semi-circle,

P = (2×π×r)÷2

= π×r

Next, you have to substitute r value into the formula :

r = 3 cm

P = π×3

= 3π cm

the answer is y = 11.54

hope this : )

the first option is the answer.