Aim: How do we calculate the areas of rectangles and triangles?
You can calculate the areas of rectangles and triangles by using their formulas.

First of all what is the definition of area?

Area means the amountof surface area a figure takes up.

We sre going to learn how to find the area for traingle and rectangles.

Rectangles

There are two ways to find the area of a rectangle.

The first way is by counting the square units.
1 box is one square unit therefore the area of the rectangle below is 8 square units.



Another way is by using the formula which is



HERE IS A GREAT EXAMPLE:







All you have to do is multoply the length and the width. In this exapmle, the length is 5 inches and the width is 3 inches so the area is going to be 15 inches to the cube.

HINT: ALWAYS MULTIPLY THE MEASUREMENT MEANING INCHES CENTIMETERS AND ETC.!!

Try it on your own!!

Arectangle has width of 10 cm and a length of 18 cm what is the area of the rectangle?

Also, if a problem gives you the area and asks you for the length or width all you need to do is divide the two numbers.

For example, if a rectangle has an area of 24 cm squared and they give you the length whivh is 6 cm. All you have to do is divide the two numbers and your supposed to get 4 cm.


Triangles

Traingles also can be measured by square units and also by usong the formula.

Here is an examplke using square units.
Follow the same steps just count the little squares.






Using the first triangle count how many square unbits it has.

Answer:aprox. 33 square units

What is the formula for finding the area of a triangle?





Base times height divided by two.

Here is an example:



The height is 4 ft. in this figure and the base was 6 ft so 6 ft.*4ft.= 24 ft./2 =12 ft.

By the what if you get confused and do not know what measurment is the height the answer will be the one with the right angle on the top or bottom.



Try it on your own:
What is the area of the triangle below.




All info from my brain. and images fro google and my drawing in paint!!