You need to multiply the base by the height.
you can find the answers in this website.
https://www.enotes.com/homework-help/topic/the-war-of-the-wall
hope it helps u it has the question then the answer
The number next to a variable, for example: 5x, is called a coefficient. And all you do is multiply the number with the variable
As a engineer who was mechanical then electrical most buildings, schematics,etc require some form of calculation for some shapes seeing that those shapes are what make up the world. Say for example you need to make something like a mother board pro house knowing it's shape and angle helps make a more accurate structure during the blue printing and build phase. No one just goes in and wings it you need to determine angles for things you don't know that the point of it.
