The formula to find the area of a triangle is

If you have any more questions let me know!
Circumference
C = pi d
C = 3.14 x 10
C = 31.4 cm
Area
A = pi r^2
A = 3.14 x 5^2
A = 78.5 cm^2
D the sample mean would less closely model the population mean
It's 8 because the number in front of the variable is the slope, while the past 30 is the y intercept