Cora drew 2 regular triagles. each side of the first triamgle was 9 centimeters long. each side of the second triangle was 21 centimetrs long. in centimeters what was the difference between the perimeters of the two triangles

First triangle 9x3=27cm
Second triangle 21x3=63cm

Difference = 63-27=36cm

Hope this helps.

The ratio between the tree and shadow is 12:9, which can be simplified to 4:3. as we now have a shadow of a building, we can use to ratio and scale it up to find how tall the building is.

4:3
?:24
how many times does 3 go into 24? it goes 8 times, so we multiple the 4 by 8 to get 32
32:24