Which measure of central tendency best describes the data? 45,45,46, 52,100,43,98,46,81​

Given that de, df, and ef are midsegments of △abc, and de=3.2 feet, ef=4 feet, and df=2.4 feet, the perimeter of △abc is .

What is the area of the triangle 10 13 12

If a || b and e || f , what if the value of y ?