He is interested in synchronic linguistics.

He is thought to be a very unsociable person.

This shape is a parallelogram.

He is working round the clock.

My four treasures of the study are a fountain pen, a pencil, an eraser, and a ruler.

He is doing squats to train his quadriceps femoris muscle.

Please calculate the quartiles of this data set.

This regular tetrahedron is composed of equilateral triangles on all sides.

The great icosihemidodecahedron is a cube with a very complex shape.

This is a model of a muoctahedron.