10.1Perimeter and Area of Basic Figures
Quick Answer
Perimeter is the total distance around a figure. Area is the measure of the region enclosed. Key formulas: rectangle A = lw, parallelogram A = bh, triangle A = ½bh, trapezoid A = ½(b₁+b₂)h, circle A = πr².
Essential Question
How do the area formulas for all basic plane figures relate to the fundamental rectangle formula A = bh?
Learning Goals
- 1State and apply perimeter formulas for common polygons.
- 2State and apply area formulas for rectangles, parallelograms, triangles, and trapezoids.
- 3State and apply circumference and area formulas for circles.
- 4Choose the correct formula for a given figure.
Key Vocabulary
Perimeter
The total length of the boundary of a two-dimensional figure.
Area
The number of square units needed to cover a two-dimensional figure.
Height (of a polygon)
The perpendicular distance between the base and the opposite side or vertex.
Full lesson content coming soon
Worked examples, guided practice problems, a workbook, quiz, and downloadable PDF resources will be added to this lesson in Phase 2. The learning goals and vocabulary above reflect the complete lesson scope.