Lines, Angles, and Shapes

Geometry is all about shapes, sizes, and how things fit together. You'll need to recognize common shapes, understand their properties, and calculate things like perimeter and area.

Key Ideas

• Lines: Straight paths that extend forever in both directions.
• Angles: The space between two lines that meet at a point.
• Triangles: Three-sided shapes with angles that always add up to 180°.
• Quadrilaterals: Four-sided shapes like squares, rectangles, and parallelograms.

Measuring Perimeter and Area

• Perimeter is the distance around a shape.
• Area is the space inside a shape.

Example Formulas

• Rectangle area: \( \text{Area} = \text{length} \times \text{width} \)
• Triangle area: \( \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} \)

Everyday Geometry

Geometry is used in art, building design, and even video games to create and measure all sorts of objects!