Circle O has is centered at (9, 9) and passes through (4, 9). What is the length of the diameter?

10 units

Step-by-step explanation:

Because the center of the circle is at (9 , 9) and passes through (4 , 9), the radius must be 5.

Radius - The length from the center of a circle to its edge

Diameter - The length from one edge of a circle to the opposite edge

The diameter is double the length of the radius, meaning D = 2(5).

2 × 5 = 10

So, the diameter of the circle is 10 units.

nada

step-by-step explanation:

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.