Circles Flashcards by Katie Donovan | Brainscape

Q

What part of a circle does the image below depict?

A

circumference

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Q

What part of a circle does the image below depict?

A

an arc

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Q

What part of a circle is depicted in the image below?

A

a chord

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Q

What part of a circle is depicted in the image below?

A

the diameter

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Q

What part of a circle is depicted in the image below?

A

the radius

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Q

What part of a circle is depicted in the image below?

A

a segment

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Q

What part of a circle is depicted in the image below?

A

a sector

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Q

What do we call the line depicted in the image below?

A

a tangent

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Q

What do we call the region between two concentric circles, shown in the shaded area below?

A

an annulus

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Q

What type of circles are depicted below, and what is the feature that defines them?

A

concentric circles
they all have the same centre point

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Q

What is the formula for finding the circumference of a circle?

A

2πr

or

πd

where r = radius and d = diameter

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Q

What is the formula for finding the area of a circle?

A

πr²

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