Answer:
its the multiplication property
Step-by-step explanation:
Answer:
r= 10
Step-by-step explanation:
30 - 20 = 10
I attached a picture with the answer, hope this helps :)
Answer:

Step-by-step explanation:
We are given the following in the question:

We have to prove:

Proof:

we can write:

Hence, the two triangle are congruent by SAS congruency rule.

The attached image shows the two triangle.