I can help your trying to solve the inside variable to equal the inside one Z=6
The reflection of the triangle across <span> y = -x</span><span> is the new triangle.</span>
Answer:

Step-by-step explanation:
Perimeter of the semi-circle:

16 + (-8) = 8 <== here is one
16 - 8 = 8
8 = 8 (correct)
-12 + 20 = 8 <== and another
11 + (- 3) = 8 <== and another