a. 2dTT
b. dTT/2
c. .5(dTT)
d. b and c A semi-circle is half of a circle. It's circumference is also partly the circumference of a full circle. Therefore, the answer is (d), because b and c are both the correct answer.
the circumference is the distance around the circle (like if you were to stride around it). You should be able to help yourself to it from there.
TTr =1/2 TTd
2 TTr is the circumference. R is radius and it`s partly diameter.
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