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

The opposite angles of a quadrangle intersect each other.

The wildebeest is a very rare animal.

Mr. Kakuma is my best friend.

Anyway, we need to contact her.

The angle of view of this lens is wide.

The eagle owl is a nocturnal bird, and its large eyes help it see in the dark.

He is learning calligraphy with a square brush.

We need to calculate the azimuth of this building.

If the angle of incidence is large, the reflection becomes stronger.