# Area and perimeter of triangles

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###### Lessons

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##### Examples

###### Lessons

**Perimeter of Triangles**

Calculate the perimeter of each triangle.**Area of Triangles**

Calculate the area of each triangle.**Perimeter and Area of Compound Triangle Shapes**

Calculate the perimeter and area of each compound shape. Break down the complex shapes into components (triangles and rectangles) first!**Triangles Word Problem**

The side of a skateboard ramp is a right triangle. What is the perimeter and area of the side of a skateboard ramp that has the following measurements: base=20m, height=15m, slope=25m

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###### Topic Notes

In this lesson, we will learn:

- The basic properties of the shape of the triangle
- How to understand and calculate the perimeter of a triangle
- How to understand and calculate the area of a triangle

__Notes:__- A
**triangle**is a 2D shape with 3 straight sides and 3 angles that add up to 180° - There are different types
**triangles**(classified by side lengths or angle size), but it does not change the**formulas**for area and perimeter. - The
**perimeter**is the exact distance around the shape. - Perimeter is a 1D (one-dimensional) quantity
- It uses
**units**such as meters (m, cm, mm, km), miles (mi), yards (yd), or inches and feet (in and ft) - For
**triangles**, the**formula**is written as: **P**=_{triangle}**side**+_{1}**side**+_{2}**side**_{3}- This formula does
__not__change for different types of**triangles**

- The
**area**is the space that is covered by the shape. - Area is a 2D (two-dimensional) quantity
- It uses
such as square meters (m__squared__units^{2}, cm^{2}, mm^{2}, km^{2}), square miles (mi^{2}), square yards (yd^{2}), or square inches and feet (in^{2}and ft^{2}) - For
**triangles**, the**formula**is written as: **Area**= $\large \frac{b \, \times \, h} {2}$_{triangle}- Where $b$ is base, and $h$ is height
- This formula does not change for different types of triangles, but you do need to keep in mind how to find the
**triangle’s height** - The
**triangle’s base**is any of the three straight sides **The triangle’s height**is found by placing the chosen base as the flat bottom, and then drawing a perpendicular line from that until the highest point (**vertex**); it can also be called the triangle’s**altitude**

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