Euclidean geometry is a branch of mathematics that studies the shapes of planes and spaces.

He is an expert in algebraic geometry and has written many papers in the field.

Riemannian geometry is a field of mathematics that studies geometric objects such as curves and surfaces.

He excels in understanding intuitive geometry.

He got the highest grade in the demonstrative geometry class.

He is immersed in the study of geometrical optics.

Natural numbers start from 0 and continue as 1, 2, 3, 4, 5, 6, 7, 8, 9.

Natural selection plays an important role in the evolution of organisms.

I was moved by the beauty of nature.

Calculating the natural logarithm is an important part of mathematics.