When light enters water, the angle of refraction changes.

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

His research mainly focuses on the chelicerae of spiders.

The antennae of this insect are very long.

The dogfish is a type of shark that lives in the deep sea.

Important information is included in the square brackets of this sentence.

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.

The opposite angles of a quadrangle intersect each other.

In this right triangle, since one angle is 30 degrees, its complementary angle is 60 degrees.