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Grade 4 Interactive Math Lab FREE
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Geometry Foundations
Learning Objectives
- Identify and classify 2D shapes
- Understand lines, rays, and angles
- Calculate perimeter and area
Key Concepts
Perimeter
The total distance around a shape
Area
The space inside a 2D shape, measured in square units
Angle
Formed when two rays share a common endpoint
Theory
**Types of Angles:**
- Acute: Less than 90°
- Right: Exactly 90°
- Obtuse: Between 90° and 180°
- Straight: Exactly 180°
**Perimeter Formulas:**
- Rectangle: P = 2(l + w)
- Square: P = 4s
**Area Formulas:**
- Rectangle: A = l × w
- Square: A = s²
Examples
Find the perimeter of a rectangle with length 8 and width 5
Solution: P = 2(8 + 5) = 2(13) = 26 units