Given: line ad≅ line ao

find: m∠oad, m∠dba.

!

Part 1)

Part 2)

Step-by-step explanation:

Part 1) Find the measure of angle OAD

we know that

OA=OD=radius of the circle

If line AD≅ line AO

then

The triangle AOD is an equilateral triangle

Remember that

An equilateral triangle has the three equal sides and the three internal angles equal (60 degrees each one)

so

Part 2) Find the measure of angle DBA

we know that

The inscribed angle measures half that of the arc comprising

so

----> by central angle

substitute the value

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

i have no idea just need points sorry

step-by-step explanation: