The total area of a cube is 486 cm2.
Find the area of one face and its lateral area.​

Step-by-step explanation:

A cube has 6 faces so:

Area of 1 face = 486/6 = 81 cm^2.

Lateral area = 4 * face area

= 4 * 81

= 324 cm2.

one face = 81 cm²

lateral area = 324 cm²

Step-by-step explanation:

486/6 = 81 cm²

81 x 4 = 324 cm²

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step-by-step explanation:

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12