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In the images you provided, we have several formulas related to calculating the area of polygons and circles as well as the circumference of a circle. Here's a breakdown of each formula:

1. **Area of a Triangle**:  
   \[
   A = \frac{1}{2}bh
   \]
   where \( b \) is the base and \( h \) is the height of the triangle.

2. **Area of a Rectangle**:  
   \[
   A = bh
   \]
   where \( b \) is the base (or width) and \( h \) is the height (or length) of the rectangle.

3. **Area of a Circle**:  
   \[
   A = \pi r^2
   \]
   where \( r \) is the radius of the circle.

4. **Circumference of a Circle**:  
   \[
   C = 2\pi r
   \]
   where \( r \) is the radius of the circle.

Each of these formulas helps you calculate either the area (for triangles, rectangles, and circles) or the circumference (for circles). 

Would you like a detailed example or further explanation of how these formulas are applied?

Here are 5 follow-up questions to explore this topic further:
1. How do we apply these formulas to composite shapes that include more than one polygon?
2. What is the significance of \( \pi \) in the area and circumference formulas for a circle?
3. How do you calculate the perimeter of a rectangle or other polygons?
4. Can the formula for a triangle's area be used for any type of triangle, or only right triangles?
5. What would be the result if the radius of a circle doubled in terms of its area and circumference?

**Tip:** Always make sure to use the correct units (e.g., square meters for area, meters for perimeter) to ensure consistency in your calculations.

I can find perimeter, circumference, and area of polygons.

Learn how to calculate the area of triangles, rectangles, and circles, along with the circumference of circles. This tutorial is aimed at students in Grades 6-8, covering key geometric concepts and formulas.

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