Thread: please help me with these two questions.

question 1)
Show that (4,5,2) , (1,7,3) and (2,4,5) are vertices of an equilateral triangle.

Question 2)
Find the distance from the point (-5, 2, -3) to the
a)xy-plane
b)yz-plane
b)z-axis
d)y-axis

Thank you very much.

Originally Posted by Jenny20

question 1)
Show that (4,5,2) , (1,7,3) and (2,4,5) are vertices of an equilateral triangle.

The distance between two points in three dimensions is:

So find the value of each side of the triangle.

Question 2)
Find the distance from the point (-5, 2, -3) to the
a)xy-plane

3

b)yz-plane

5

b)z-axis

Notice that the z-axis passes through the origin of the xy-plane, so find the distance from zero to the point (-5,2)

d)y-axis

Thank you very much.

Again, the y-axis passes through the origin of the xz-plane so find the distance from zero to point (-5,-3)