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Geometry > Polygons and Circles > Flashcards

Polygons and Circles Flashcards

1
Q

The formula for area of a circle

A

3.14 x r x r

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2
Q

The formula for circumference of a circle

A

6.28 x r

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3
Q

The formula for central angle of a polygon

A

360 / n

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4
Q

The formula for the exterior angle of a polygon

A

360 / n

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5
Q

The formula for the sum of the interior angles of a polygon

A

(n-2) x 180

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6
Q

The formula for one interior angles of a polygon

A

(n-2) x 180 / n

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7
Q

How many sides does a pentagon have?

A

5

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8
Q

How many sides does a hexagon have?

A

6

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9
Q

How many sides does a heptagon have?

A

7

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10
Q

How many sides does a octagon have?

A

8

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11
Q

How many sides does a nonagon have?

A

9

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12
Q

How many sides does a decagon have?

A

10

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13
Q

If the radius of a circle is 10, what is the diameter?

A

20

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14
Q

If the diameter of a circle is 16, what is the radius?

A

8

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15
Q

The formula for area of a triangle?

A

b x h /2

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16
Q

What is the definition of a “regular” polygon?

A

All the angles are the same, and all the side lengths are the same

17
Q

Convex or non-convex?

A

Convex

18
Q

Convex or non-convex?

A

Non-Convex

19
Q

Convex or non-convex?

A

Non-Convex

20
Q

Regular or Irregular polygon?

A

Regular

21
Q

Regular or Irregular polygon?

A

Irregular

22
Q

Regular or Irregular polygon?

A

Irregular

23
Q

What does this formula solve for? 3.14 x r x r

A

Area of a circle

24
Q

What does this formula solve for? 6.28 x r

A

Circumference of a circle

25
Q

What does this formula solve for? (n-2) x 180

A

The sum of the interior angles of a polygon

26
Q

What does this formula solve for? (n-2) x 180 / n

A

One interior angle of a polygon

27
Q

What does this formula solve for? 360 / n

A

The central angle OR one exterior angle of a polygon

28
Q

Is 5 the radius or diameter?

A

Radius

29
Q

Is 18 the radius or diameter?

A

Diameter

30
Q

What is the diameter of the circle?

A

6

31
Q

What is the radius of the circle?

A

7

Geometry (3 decks)

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