Question

If true then enter $1$ and if false then enter $0$

Can two adjacent angles be complementary?

Answer 1

Yes, two adjacent angles can be complementary if their sum is 90 degrees. This is only possible if both angles are acute angles and their sum is 90 degrees.
E.g.
${45}^o+{45}^o={90}^o{15}^o+{75}^o={90}^o$