AB = 9.
It is given that BC = 9 and AB = BC. Hence, AB = BC = 9.
Answer:
The arc length of the semicircle is half the circumference of the full circle
Answer:

Step-by-step explanation:
1) Change the mixed fractions into improper fractions:
2) Multiply the first fraction by 2/2 and the second fraction by 5/5 in order to create common factors on the denominator (You can do this because you are essentially multiplying by one, for example 2/2 = 1):

3) Simplify the numerator(top part) while keeping the denominator(bottom part) the same:
