Equation of a Circle — Unit test Answers

What is the center of a circle represented by the equation (x−5)2+(y+6)2=42?

A regular polygon is drawn in a circle so that each vertex is on the circle and is connected to the center by a radius. Each of the central angles has a measure of 40°. How many sides does the polygon have?

is tangent to circle P at point Q.

Circle O has a circumference of approximately 28.3 cm.

Which circle shows that measures 60°?

What is the radius of a circle whose equation is (x – 7)2 + (y – 10)2 = 4?

What is the center of a circle represented by the equation (x+9)2+(y−6)2=102?

Arc QVT measures 156°.

Triangle JKL is equilateral. One side of the triangle, JL, is a diameter of circle M. Which is true about line segments JK and KL?

Circle Y is shown. Line segments X Y and Z Y are radii. The length of X Y is 16. Sector X Y Z of the minor angle is shaded.

Circle H is shown. Line segments G H and J H are radii. The length of G H is 20. Angle G H J is 162 degrees.

Circle F is congruent to circle J, and ∠EFD ≅ ∠GJH.m∠DFE = 80°. What is the measure of arc ?°

Which statements about the clock are accurate? Select three options.

A circular table top has a radius of 24 inches.What is the area of the table top, to the nearest square inch? Use 3.14 for .

What is the radius of a circle whose equation is x2+y2+8x−6y+21=0?

Line segment ON is perpendicular to line segment ML, and PN = 10.

Consider circle N with radius 30 cm and radians.

Circle B is shown. Line segments C B, D B, and E B are radii. Angle C B E is 52 degrees and angle E B D is 160 degrees.

Given: Circle O; intercepts ; D intercepts Prove:

In circle O, MP is a diameter.