If D, E, and Fare midpoints of the sides of triangle ABC, find the
perimeter of triangle AB

the radius is 2 times the diameter.

step-by-step explanation:

isaiah walks 3 miles due north, turns and then 5 miles due east. how far is he from his starting point?

a^2 + b^2 = c^2

let c = distance from starting point.

(3)^2 + (5)^2 = c^2

9 + 25 = c^2

34 = c^2

sqrt{34} = sqrt{c^2}

sqrt{34} = c

a ≈ 172.05

step-by-step explanation:

the pictures.