Please Help! Circles

Question

If you can please help me out! There are two pictures with one problem listed on each. Thank you so much in advance. You might have to copy and paste the link i typed out and the pictures should pop up.

http://s292.photobucket.com/user/dneesy1994/media/picture%202_zpsoy0lyyjn.jpg.html?sort=3&o=0

Answer 1

(1)

For to be perpendicular to , should be right angle().

In a triangle AFE, and .

Find .

Sum of angles in a triangle is .

Therefore, in a triangle ADE

Since is not right angle, is not perpendicular to .

Answer 2

(2)

Step 1:

The circle equation is .

Standard form of the circle equation is .

Wheere  is center and  is the radius.

Rewrite the circle equation as  .

Center of the circle  and radius .

Diameter of the circle is twice its radius.

Diameter of the circle is 6.

Consider 

Solve for .

Construct a table for different values of .

Step 2:

Graph :

Plot the center .

Plot the points obtained in the above table.

Connect those points with a smooth curve.

Graph the circle .

Solution :

(a) Center of the circle .

(b) Radius  and Diameter of the circle is 6.

(c) Graph of the circle .