a. CPCTC is your answer
CPCTC means that "Congruent Parts of a Congruent Triangle(s) are Congruent"
If ΔBRM ≅ ΔKYZ (given), then every part inside the triangle is ≅ with the corresponding side.
So, for example Line BR will be ≅ with Line KY, etc
hope this helps
Answer:

Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable.
The next larger whole number is 638 .
The next smaller whole number is 637 .
637.892 is closer to 638 than it is to 637 .
The nearest whole number is 638 .
Infinite they’re all multiples, so they are the same line
The most accurate "estimation" for 5+4 is um... 9