The figure below shows two triangles efg and klm.
which step can be used to prove that triangle efg is also a right triangle?
answer

prove that a + b is greater than c in triangle efg so c2 = a2 + b2.

prove that kl = ef so in triangle klm c2 = a2 + b2 which makes triangle efg a right triangle.

prove that the sum of the squares of a and c in triangle efg is greater than square of b in triangle klm.

prove that the sum of the squares of a and b in triangle klm is greater than square of c in triangle efg.

Answer

Prove that KL = EF so in triangle KLM c2 = a2 + b2 which makes triangle EFG a right triangle.

Explanation
For a right triangle, the sum of the legs squared is equal to the hypotenuse squared. 
So, in the triangle EFG, a²+b²=c².
To make EFG a right triangle at G, we can compared ΔEFG and ΔKLM. Line EF=KL.
The correct answer from the choices is; "Prove that KL = EF so in triangle KLM c2 = a2 + b2 which makes triangle EFG a right triangle".

13=7.8514=3.5feet15=10.99feet16=2& 317=418=about 9ft19=7.8520=4in

step-by-step explanation:

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle