It's difficult to calculate the area of this hexagon.

We have a responsibility to protect this world.

Souroku is my best friend.

This regular dodecahedron is a geometric shape with perfect symmetry.

This solid is called a regular icosahedron, and it is made up of 20 equilateral triangles.

We were waiting in the waiting room until the concert started.

He was playing by folding a paper aeroplane.

I have been to Mexico.

He was bored to death, so he decided to grind tea.

The defendant claimed innocence.