Key Concepts:
- Perimeter of a Rectangle: Rectangles have opposite sides equal, (P = 2(l + w)). Squares have four sides equal.
- Perimeter of a Triangle: Sum of its three sides. Isoceles triangles have two sides equal. Equilateral triangles have three sides equal.
- Perimeter (Circumference) of a Circle: Given radius ((r)), (C = 2\pi r). Given diameter ((d = 2r)), (C = \pi d).
Skills Covered:
- Calculating the perimeter of a 2D shape (circles, triangles, rectangles).
- Determining the side length of a triangle/rectangle given its perimeter.
Example Problems:
- What is the perimeter of a square with the side length of 8?
- A circle has a radius of 2. What is the circumference of the circle?
- What is the side length of an equilateral triangle with a perimeter of 18 cm?