Circles Review slides

Circles Review Slides

​Equations of Circles

Multiple Choice

What is the equation of a circle with radius 6 and center (-2, 7)?

• (x+2)² + (y-7)² = 6

• (x-2)² + (y+7)² = 6

• (x-2)² + (y+7)² = 36

• (x+2)² + (y-7)² = 36

Multiple Choice

What is the equation of the circle?

• (x+1)² + (y +1)² = 3

• (x+1)² + (y -1)² = 3

• (x+1)² + (y +1)² = 9

• (x-1)² + (y -1)² = 9

​Arc Length and Sector Area

Multiple Choice

Find the length of the minor arc.

• 5.50 cm

• 11.0 cm

• 76.97 cm

• 45 cm

Multiple Choice

Find the area of sector AOB.

• 6.28 in²

• 12.57 in²

• 25.13 in²

• 201.06 in²

Multiple Choice

The area of sector AOB is 12.57 in². What is the area of the green shaded area?

• 4.57 in²

• 8.57 in²

• 20.57 in²

• 3.43 in²

Multiple Choice

What is m∠STU?

• A
• B
• C
• D

Multiple Choice

• A
• B
• C
• D

Multiple Choice

What is the measure of arc AB?

• 140
• 142
• 180
• 38

Fill in the Blank

m∠GEF = _____ degrees

(Type only the number)

Fill in the Blank

m∠R = _____ degrees

(Type only the number)

Tangent segments from the same exterior point are congruent.

​Tangnts to a Circle

Multiple Choice

Find the perimeter of the triangle.

• 62.2

• 58

• 55.5

• 58.85

Follow the formula!

​

Segment Lengths in Circles

Multiple Choice

Which of the following are possible measurements of x and y?

• x = 3 and y = 10

• x = 4 and y = 9

• x = 4 and y = 10

• x = 3 and y = 12

Multiple Choice

Segment BC is tangent to the circle.

Find the value of a.

• 4
• 6.93
• 8
• 16

Multiple Choice

Solve for x.

• 11

• 17

• 18

• 12

A full circle is 2𝛑 radians or 360 degrees

Radians and Degrees

Multiple Choice

What is π/2 radians in degrees? 

• 60

• 45

• 180

• 90

Multiple Choice

What is 2π/3 radians in degrees? 

• 150
• 120
• 180
•  30

Multiple Choice

What is 240 degrees in radians? 

• π/3
• 4π/3
• 5π/3
• 2π/3