When light hits a mirror, the angle of incidence and the angle of reflection become equal.

The angle of friction of this material is 30 degrees.

When light enters water, the angle of refraction changes.

The pheasant-tailed jacana, known as 'the ballerina of the water' for its beautiful appearance.

The calculation of the spherical angle is a part of geometry.

He was playing the guitar at the street corner.

The era of the Five Good Emperors is considered the golden age of the Roman Empire.

He is playing a foolish character named Rho.

Who wrote the screenplay for this movie?

We have a responsibility to protect this world.