Please teach me how to calculate the area of this circular sector.

I went to the stationery store to buy new letter paper.

Please stop inquiring about his private life.

Yu helped me with my homework.

The season of spring has come.

He shook his head up and down and left and right.

He lives with the spirit of 'I alone am the honored one under heaven and on earth.'

She dyed her hair blue.

Their home is always filled with amiability, to the point where everyone envies them.