http://www.ck12.org Chapter 4. Triangles and Congruence
AB=
√
(− 6 −(− 2 ))^2 +( 5 − 10 )^2
=
√
(− 4 )^2 +(− 5 )^2
=
√
16 + 25
=
√
41
BC=
√
(− 2 −(− 3 ))^2 +( 10 − 3 )^2
=
√
( 1 )^2 +( 7 )^2
=
√
1 + 49
=
√
50 = 5
√
2
AC=
√
(− 6 −(− 3 ))^2 +( 5 − 3 )^2
=
√
(− 3 )^2 +( 2 )^2
=
√
9 + 4
=
√
13
Now, find the distances of all the sides in 4 DEF.