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Answer:
Angles 1 and 2
Explanation:
Because a complementary is a sum of 90 degrees so the small box makes it 90 degrees making angle 1 and 2 complementary
∠ 1 and ∠ 2
complementary angles are 2 angles whose sum is 90°
from the diagram the square box denotes a right angle = 90°
the 2 angles which form this angle are 1 and 2 , then
∠ 1 and ∠ 2 are complementary angles