How do you find the diameter of a circle?

The diameter is twice the radius.

What is the relationship between a chord and the center of the circle?

A chord is perpendicular to a radius if it bisects the radius.

What is the circumference of a circle with radius 5?

The circumference is $$C=2\text{π}r=10\text{π}$$ .

What is the area of a circle with radius 4?

The area is $$A=\text{π}r^2=16\text{π}$$ .

What is the definition of a tangent line to a circle?

A tangent line touches the circle at exactly one point.

What is the relationship between the angles formed by two intersecting chords?

The measure of the angle is equal to half the sum of the measures of the arcs intercepted by the angle.

What is the formula for the arc length of a circle?

The arc length is given by $$L=\frac{\theta}{360} \times 2\text{π}r$$ , where θ is the central angle in degrees.

Unit 10: Circles TEST Flashcards - 15 Cards (9th Grade)

Student preview

15 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.

2.

FLASHCARD QUESTION

Front

Which segment represents a chord?

Back

Segment GD is a chord.

3.

FLASHCARD QUESTION

Front

What is the measure of angle A if it is given as 79°?

Back

Angle A measures 79°.

4.

FLASHCARD QUESTION

Front

How do you write the equation of a circle with center (1, 5) and radius 2?

Back

The equation is $(x-1)^2+(y-5)^2=4$ .

5.

FLASHCARD QUESTION

Front

What is the measure of angle

Back

Angle

6.

FLASHCARD QUESTION

Front

What is the approximate numerical value of π?

Back

The value of π is approximately 3.14.

7.

FLASHCARD QUESTION

Front

What is the standard form of a circle's equation?

Back

The standard form is $(x-h)^2+(y-k)^2=r^2$ , where (h, k) is the center and r is the radius.

8.

FLASHCARD QUESTION

Front

What is the radius of a circle if the equation is $(x-3)^2+(y+2)^2=9$ ?

Back

The radius is 3, since $r^2=9$ .

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