The part of the proof that uses the justification that angles with a combined degree of 90° are complementary is; Congruent Complements Theorem
<h3>How to prove complementary angles?</h3>
We are given;
m∠1 = 40°
m∠2 = 50°
∠2 is complementary to ∠3
We want to prove that ∠1 ≅ ∠3
Now, when the sum of two angles equals 90°, they are called complementary angles.
Now, looking at the angles, the proof that ∠1 ≅ ∠3 is Congruent Complements Theorem. This is because If two angles are complements of the same angle (or congruent angles), then the two angles are congruent.
Read more about Complementary angles at; brainly.com/question/98924
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Answer:
(x-2)(x^2+1)
Step-by-step explanation:
It’s the first one because it has 7 rows and 7 columns which show that it is 7 times 7 or 7^2.
A is the correct answer
(to find diagonal of a square , you can get help from Pythagorean Theorem)

good luck
5 because 14x5 equals 70 and you add the 1 blue paint each time so it’d be 75 total