He found a building shaped like a pyramid.

In shogi, it's difficult to understand the movement of the bishop.

My mobility dog helps me live my daily life.

He is good at making cocktails.

The absolutive case is a grammatical case that can represent both the subject and the object.

He made a sentence using the accusative case.

This triangle has two acute angles.

He used his knowledge as an instrumental case to solve the problem.

The opposite angles of a quadrangle intersect each other.

This triangle has one obtuse angle.