1) Triangle DEF has sides DE = 12, EF = 6, and DF = 8. Is triangle DEF congruent to triangle ABC? Show your work using the distance formula.
Step-by-step explanation:
use phytagoras
c² = a² + b²
c² = 8² + 6²
c² = 64 + 36
c² = 100
c = √100
C = 10