The base of a right circular cylinder has a diameter of 5.00 inches. sally measured the circumference of the base cylinder and recorded it to be 15.5 inches. what is the percent of error in her measurement? express your answer to the nearest tenth of a percent.
explain what you did to get your answer!

The percent of error in her measurement is 1.3%

Step-by-step explanation:

we know that

The circumference of a circle is equal to

where

D is the diameter

we have

assume

substitute

----> This value represent the 100% (theoretical value)

Find the difference between the theoretical value and the measured value

Find the percentage by proportion

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.