Answer:
12
Step-by-step explanation:
Using the pythagorean theorem we have DE^2 + 5^2 = 13^2
DE^2 = 169 - 25 = 144
DE = sqrt144 = 12
Or, you could just remember the triangle 5-12-13, as it is pretty common, along with 3-4-5, 7-24-25
Only one because a triangle has all together 180 degrees therefore even one is 91 degrees the other one would have to be less than 91 making it acute
Answer: A, C, E.
Hope it helped got it correct on edge and please mark as brainlest.
nine goes into the number 3 times
