Geometri is a branch of mathematics that deals with the properties and relationships of points, lines, surfaces, and shapes. It helps us understand the dimensions and spatial relationships in our world. Common geometric figures include triangles, circles, and squares, each with specific properties and formulas for calculating area and perimeter. In addition to basic shapes, geometri also explores more complex concepts such as angles, congruence, and symmetry. It is widely used in various fields, including architecture, engineering, and computer graphics, to design structures and create visual representations of data.