Area formulas are different for each shape because each shape has its own special features. Let’s look at the area formulas for some basic shapes you might study in Grade 9:

1. Triangle

   • Formula: Area (A = \frac{1}{2} \times \text{base} \times \text{height})
   • The base and height meet at a right angle.

2. Rectangle

   • Formula: Area (A = \text{length} \times \text{width})
   • Length and width are two straight measurements.

3. Circle

   • Formula: Area (A = \pi r^2)
   • In this formula, (r) stands for the radius, which is the distance from the center to the edge of the circle.

4. Trapezoid

   • Formula: Area (A = \frac{1}{2} \times (\text{base}_1 + \text{base}_2) \times \text{height})
   • This formula uses the two bases and the height, which is the straight-line distance between them.

5. Parallelogram

   • Formula: Area (A = \text{base} \times \text{height})
   • It’s like a rectangle, but the angles can be different.

Each formula helps us find the area based on the shape's features. Knowing these formulas is really important to solve math problems in real life!