Prove: If a chord of a circle has a common end point with a diameter and makes an angle of 30° with it, prove that the distance from the center to the chord is one-fourth the length of the diameter.

Step-by-step explanation:

The perpendicular distance between the chord and the center of the circle forms a right triangle with the chord and the radius.  Using trig:

sin 30° = x / (D/2)

sin 30° = 2x / D

1/2 = 2x / D

x = D/4

the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!