Answer:
-1.4335
Step-by-step explanation:
8*2=16
8*8=64
d+d+d=3d
16+64=80d3rd
Student 4 has the largest percent error.
Step-by-step explanation:
The percent error of a measurement is given by

where
x is the value of the measurement
is the actual value
For student 1:

Percent error:

For student 2:

Percent error:

For student 3:

Percent error:

For student 4:

Percent error:

So, student 4 has the largest percent error.
Learn more about errors:
brainly.com/question/2764830
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We are given the length of AC and AB to be 20 and 6, respectively, so we can subtract 6 from 20 to find BC to be 14 cm.
The circumference of a circle is equal to


The answer is approximately 87.96 cm