Area of a triangle= 1/2 bh
If you are a kid that formula can look like gibberish.
Let’s use geoboards to help that formula make sense!
The area of this square is 16. I can count those squares and that makes perfect sense.
Now I’m cutting the square in half and making a triangle.
What’s the area of that triangle? Half of 16 = 8
Booyah! I understand that.
1/2 of 4 X 4 = 8
1/2 of b x h
Let’s try this again:
I’m cutting up another triangle. Let’s find the area of that blue one.
Logic tells me that the blue triangle is half of the green one. The green triangle = 8. So the blue trianle should equal 4, right?
Let’s proove it!
If I use my imagination I can flip half of the triangle over and it becomes a complete square. Now I can “see” that the area of the blue triangle is four.
Or I can use the formula:
1/2 of b x h = 1/2 (4 x 2) = 4