Question

Which of the following pair of angles are complementary angles ?

• A. ${30}^o\text{and}{60}^o$
• B. ${45}^o\text{and}{45}^o$
• C. $1^o\text{and}{89}^o$
• D. ${12}^o\text{and}{78}^o$

Answer 1

Answer: (A), (B), (C), (D)

${12}^o\text{and}{78}^o$

We know, The pair of angles are known as complementary if the sum of both angles is ${90}^o$.
Now, we see in all the given options sum of all pairs give us ${90}^o$.
Hence, All options are correct.