I have attached the choices given for this question
Answer:measure angle XDC = 90 degrees
Explanation:The term "perpendicular" implies that the angle formed between the two lines is 90 degrees.
These two lines do not have to be equal in length, they just intersect forming a 90-degree angle.
Comparing the explanation with the given choices, we would find that the only correct choice is:
measure angle XDC = 90 degrees
Hope this helps :)

<u>Answer:</u>
The solution to the equation is: <u>±</u><u>2</u><u>.</u>
Hope you could get an idea from here.
Doubt clarification - use comment section.
Answer:
Positive one
Step-by-step explanation:
Answer + Step-by-step explanation:
<u>the conditional statement</u> :
For two positive integers n and m,
nm = 4 ⇒ (n = 1 or m = 1) or (n=m= 2)
<u>the contrapositive</u>:
(n ≠ 1 and m ≠ 1) and (n ≠ 2 or m ≠ 2) ⇒ nm ≠ 4
<u>Prove the conditional by proving the contrapositive</u> :
Suppose
m ≠ 1
and m ≠ 2
and n ≠ 1
⇒ nm ≠ 1 × n and nm ≠ 2 × n and n ≠ 1
⇒ nm ≠ 4 (because 4 = 4 × 1 or 4 = 2 × 2)
<u>Conclusion</u>:
The contrapositive is true then conditional is true.