Geometry Chapter 10 Flashcards

1
Q

A circle may be inscribed in

A

any regular polygon

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1
Q

For a regular polygon of n sides: Each exterior angle e measures

A

360/n

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2
Q

In a circle of radius r, the length l of an arch of measure n degrees equals

A

n/360 of the circumference of the circle

l=n/360 X2piR

pinR/180

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3
Q

Area of a circle

A

1/2 Circumference(radius)

1/2 (2 pi radius)(radius)

pi r^2

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4
Q

The length of an altitude of an equalateral triangle equals

A

the sum of the apothem and the radius

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5
Q

Corresponding segments of regular polygons having the same number of sides are

A

in proportion.

(includes sides, perimeters, radii or circumferences of circumscribed or inscribed circles and such)

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5
Q

Sector of a circle

A

part of a circle bounded by two radii and their intercepted arc.

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6
Q

The area of a regular polygon equals

A

1/2 (perimeter)(apothem)

1/2(numberofsides)(lengthofsides)(apothem)

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8
Q

If a regular polygon of n sides has a length of s

A

The perimeter is p=ns

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9
Q

apothem of a regular hexagon equals

A

1/2 the radius X square root of 3

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9
Q

If a regular polygon is inscribed in a circle, each segment cut off by the polygon has area equal to the difference between

A

the area of the circle and the area of the polygon divided by the number of sides.

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10
Q

The apothem and radius of a square form a

A

45-45-90 triangle

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10
Q

The apothem of a square equals

A

1/2 a side

or

1/2 the radius X square root 2

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10
Q

Regular polygons having the same number of sides are

A

similar

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11
Q

An equilateral polygon inscribed in a circle

A

is a regular polygon

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12
Q

In an equilateral triangle, the apothem is

A

1/3 the altitude

12
Q

Circumference=

A

pi(diameter)

or

2(pi)(radius)

14
Q

For a regular polygon of n sides: Each interior angle i measures

A

(n-2)180/n

14
Q

The area of a minor segment of a circle equals

A

the area of its sector less the area of the triangle formed by its radii and chord

16
Q

The apothem and the radius of a hexagon form

A

30-60-90 Triangles

17
Q

In the regular hexagon, square, and equilateral triangle, what kind of figures are formed.

A

Special right triangles are formed when the apothem r and a radius R terminating in the same side are drawn.

18
Q

The length of a side in an equilateral Triangle equals

A

Radius X square root 3

20
Q

The apothem and radius of an equilateral triangle form

A

30-60-90 Triangles

21
Q

Radii of a regular polygon are

22
Segment of a circle
part of a circle bounded by a chord and its arc. A minor segment of a circle is the smaller of the two segments thus formed.
23
In an equilateral triangle, the Radius is
2/3 the altitude
25
An apothem of a regular polygon
bisects the side to which it is drawn.
26
A circle may be circumscribed about
any regular polygon
28
For a regular polygon of n sides: Each central angle C measures
360/n
29
The center of the circumscribed circle of a regular polygon is also
the center of its inscribed circle
31
The length of a side of a regular hexagon equals
the length of the radius
32
A radius of a regular polygon
bisects the angle to which it is drawn
33
Area of a sector of n degree --------------------- Area of the Circle =
length of an arc of measure n degree --------------------- Circumference of the circle = n/360
34
In a circle of radius r, the area K of a sector of measure n degree equals
n/360 of the area of the circle or K=n/360 X piR^2
35
The side of a square equals
radius X square root 2
36
In an equilateral triangle, the apothem equals
1/2 the Radius
37
Areas of regular polygons having the same number of sides are to
each other as the squares of the lengths of any two corresponding segments
38
Apothems of a regular polygon are
Congruent