Question

what is the area ,measured in square cenimeters of a triangle base is 9 height is 4 what is half of 9 ?

Answer 1

\[\frac{9}{2}\]

Answer 2

we can do area with determinates too ;)

Answer 3

really?

Answer 4

the determinate of a matrix is the area of the "rectangle"

Answer 5

and a triangle is half that

Answer 6

btw you do not need half of nine. what you need is
\[A=\frac{base\times height}{2}=\frac{4\times 9}{2}=2\times 9\]]

Answer 7

det | a b | = area of "rectangle"

Answer 8

hmm so what is a and b in this case?

Answer 9

vectors

Answer 10

ok . but what vectors are they in this example?

Answer 11

b = 9,0
a = 0,4

if i read it right

Answer 12

ok then i guess it must be right, since answer is 18

Answer 13

\[{{9\ 0}\choose{0\ 4}}^{0}_{36}=36-0 = 36\]

Answer 14

hell of a way to make a matrix!

Answer 15

4.5

Answer 16

@blanca half of 9 is 4.5, but your area is 18

Answer 17

think of it as half the area of a rectangle

the area of a rectangle is base x height

so divide that in half