skyeriley41 skyeriley41

24-06-2020
Mathematics

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jimrgrant1 jimrgrant1

24-06-2020

Answer:

∠ b = 12°

Step-by-step explanation:

Complementary angles sum to 90°, thus

a + b = 90 ← substitute a = 78

78 + b = 90 ( subtract 78 from both sides )

b = 12

That is ∠ b = 12°

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