#does anybody know a formula for this?

14 messages · Page 1 of 1 (latest)

fleet pelican
safe dockBOT
fleet pelican
#

hey I'm not sure how to do question c

#

I know if you want to find an angle of two vectors you use this formula

#

$\frac{\mathbf{u} \cdot \mathbf{v}}{|\mathbf{u}| |\mathbf{v}|}$

turbid radishBOT
fleet pelican
#

but im not sure how to do it for a vertex

#

the solution is arccos(√2/3)

#

would really appreciate any help

crisp rivet
# fleet pelican but im not sure how to do it for a vertex

the question asks you to find the angle at the vertex A.
which is the angle between the vectors AB and AD
you can find AB with OB - OA
and AD with OD - OA
all of which are given to you in the question.
now that you have AB and AD vectors, you can use the dot product on these 2 vectors.

fleet pelican
#

ohhh

#

i understand now

#

thanks :)

#

.close