Everything about number one is because it's a half of circle so its area = 1/2 ¶r^2 and its perimeter = ¶r
Using pythag a^2+b^2=16^2
16^2=256
and since a=b the equation is 2x^2=256
/ each side by 2
x^2=128
x=sq rt of 128=11.31 roughly
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Answer:
6 miles
Step-by-step explanation:
20 - 2 is 18, 18/3 is 6.