Problems based on angles of a regular polygon

Q.

The given figure shows a square and a regular pentagon put together. Which of the following statements is true?

1. $\angle ABC={162}^{\circ }$

2. $\angle BAC=\angle BCA={18}^{\circ }$

3. $\angle BAC=\angle BCA=9^{\circ }$

4. BA=BC

Q. Question 182
A regular pentagon ABCDE and a square ABFG are formed on opposite sides of AB. Find $\angle BCF$?

Q. All squares are ___________.

1. big
2. similar
3. equal
4. congruent