Geo Un7Wk4 - Circle Unit Review

Geo Unit on Circles

By Chip Krolik

Multiple Choice

Determine the measure of ∠NOP

• 15°

• 20°

• 40°

• 50°

Multiple Choice

Find the measure of arc NL

• 21°

• 42°

• 45°

• 84°

Multiple Choice

What part of the circle is this line?

• Tangent

• Secant

• Chord

• Diameter

• None of these

Multiple Choice

Can a secant be a tangent?

• yes they are both the same line

• yes they are both parts of a circle

• No secant intersects twice and tangent intersects once

• No they both have nothing to do with circles

Multiple Choice

Solve for x.

• 29
• 33
• 41.5
• 50
• none of these

Multiple Choice

What is the part of the circle highlighted in red called?

• semi-circle

• major arc
• minor arc
• sector

Multiple Choice

A line that intersects a circle at two points

• secant
• circle
• chord
• tangent

Multiple Choice

What is the center and radius for a circle with the equation:
(x-4)²+(y+2)²=25

• C:(4, -2), r=5
• C:(-4, 2), r=5
• C:(4, -2), r=25
• C:(-4, 2), r=25

Multiple Choice

What is the center of the circle with equation x² + y² = 1?

• (1, 1)
• (0, 0)
• not enough information
• (-1, -1)

Multiple Choice

Write the equation of a circle with center (7, 0) with radius 3.

• (x - 7)² + y² = 9
• x² + (y -7)² = 9
• (x - 7)² + y² = 3
• x² + (y -7)² = 3
• none of these

Multiple Choice

How big is angle b?

• 50 degrees
• 60 degrees
• 70 degrees
• 75 degrees

Multiple Choice

Two tangents CD and CB intersect circle A. Find the length of the tangent segment BC.

• 2
• 3
• 9
• 14

Multiple Choice

What is the m∠C?

• 50
• 25
• 100
• 55

Multiple Choice

solve for x.

hint* central angle = arc measure. diameter makes a semicircle = 180 degrees

• 21.25

• 13.6

• 43.75

• 10

• none of these

Multiple Choice

What is the measure of arc AB?

• 140
• 142
• 180
• 153

Multiple Choice

If the measure of arc ABC = 210°, what is the measure of ∠AOC?

• 150°
• 100°
• 210°
• 105°

Multiple Choice

What is the center of the circle given by the equation (x - 7)² + (y + 3)² = 25

• (-7,3)

• (7,-3)

• (3,-7)

• (-3,7)

• none of these

Multiple Choice

Find the circumference (to the nearest whole number)

• 88 in
• 44 in
• 116 square in
• None of the above

Multiple Choice

What is the "formal" definition of pi?

• 22/7
• 3.1415926
• the ratio of a circle's circumference to its diameter
• the surface area of a sphere of diameter 22/7
• none of these fully meet the formal definition of 'pi'

Poll

After this review, I feel --- about the unit on circles

• very good/confident

• good/confident

• eh, so-so, I suppose

• lost! I don't know anything about any of this stuff

• other: my thoughts/feelings are not listed here