Given:
.
To find:
The value of r.
Solution:
We have,
.
We know that the radius is perpendicular to the tangent at the point of tangency
AD is the tangent and CD is the radius. So, CD is perpendicular to AD at point D, i.e.,
.
Using Pythagoras theorem, we get




On further simplification, we get



Therefore, the value of r is 9.
D is the right answer you just have to minus
Answer:
A) reflection across the y-axis
Step-by-step explanation:
If
, then this says that two
-coordinates are equal for opposite values of
.
Let
a point on
.
Then
.
We also know that
and therefore
is also a point on the graph.
If you graph [/tex](-a,b)[/tex] and
you will see they are symmetrical to each about the
-axis.
Example if given both
and
, then
. This means both (2,3) and (-2,3) are points on the graph.
Here is what those two points look like on a Cartesian Plane (please see graph in picture).
As I look into the problem with a deeper meaning then math I realize this answer can be not as hard as it appears and it could be hard to answer it
Answer:
Step-by-step explanation:
There are five lines of symmetry in a regular pentagon:
Each going from side midpoint to opposite vertex.
here is a drawing of all of them filled in: