Elementary Math Test 3

Front 1

circular region

Back 1

area inside the circle

Front 2

radius

Back 2

distance from the center to the edge

Front 3

diameter

Back 3

starts @ one side of the circle goes through the center point and ends up on the other side

Front 4

2 kinds of slices of a circle

Back 4

segment(made from a chord) and sector(pizza slice)

Front 5

If you know the measure of an arc, how do you find the measure of the rest of the circle(the other arc)

Back 5

360 - the measure of the given arc

Front 6

central angle

Back 6

an angle with its vertex at the center of the circle

Front 7

inscribed angle

Back 7

and angle with its vertex on the circle and its sides along chords of the circle (intercepts and arc)

Front 8

angle bisector

Back 8

when one angle is cut into 2 angles of the same size

Front 9

perpendicular bisector

Back 9

bisects a line segment into 2 equal parts.

Front 10

2 or more circles with the same center are said to be

Back 10

concentric circles

Front 11

a line that touches a circle in only on point is called a __________ to the circle

Back 11

tangent

Front 12

a _______ is the 3D set of points at a fixed point. (center)

a ______________ is a half a sphere

Back 12

sphere

hemisphere

Front 13

Curves and circles are needed because ________ and _________ alone make it hard to model real life objects.

Back 13

straightness and flatness

Front 14

steps for constructing a congruent line segment

Back 14

1. use a ruler to draw a line longer than the original.

2. open the compass on the original line and measure the distance from the 2 points

3. keep the compass @ this distance, and draw dots at the same distance on the new line.

Front 15

steps for constructing a perpendicular bisector of a line segment

Back 15

1. open compass to span of 2/3 the distance of the original segment.

2. with this width, draw an arc above and below the line.

3. go to the other end and do the same

4. draw a straight line b/w where the arcs intersect

Front 16

steps for constructing an angle congruent to angle B

Back 16

1. draw a straight line, label point B

2. measure about 2/3 of original line. draw an arc on the original

3. with the same measurement on the compass draw an arc on the new drawing

4. from point B measure to the arc, do this for the new picture, draw the straight line

Front 17

steps for constructing congruent triangles

Back 17

1. measure from point A to the point next to it

2. with this measurement, go to new point P and draw an arc

3. label this point R

4. Measure on original from A to B

5. with this measure, from new point P draw an arc

6. on original, measure from B to C

7. with this measure, from previous arc, draw another and label this point Q

8. connect the dots

Front 18

two type of sectors

Back 18

quadrant and semicircle

Front 19

circumference

Back 19

the distance around the edge of the circle

Front 20

how do you get pi

Back 20

circumference/diameter

Front 21

when the diameter is 1, the circumference is....

Back 21

3.14.......

Front 22

circumference =

Back 22

pi x d

Front 23

constuction

Back 23

in geometry means to draw shapes, angles or lines accurately

Front 24

define circle

Back 24

the set of all points on a plane that are a fixed distance from a center

Front 25

area of a circle

Back 25

A=pi(r)squared

Front 26

special names to describe a circle

Back 26

arc

chord

center

diameter

tangent

Front 27

chord

Back 27

a line that goes from one point to another on the circles circumference

Front 28

tangent

Back 28

a line that just touches the circle as it passes by

Front 29

arc

Back 29

part of the circumference of a circle

Front 30

two triangles are similar IF ....

& if one of the three criteria hold true

Back 30

they are equiangular
(all corresponding angles are equal)
(all corresponding sides are proportional)

AAA or AA
SSS
SAS

Front 31

2 shapes are similar IF

Back 31

1. every pair of corresponding angles have the same size

2. the ratios from every pair or corresponding lengths all equal the same value

Front 32

how do we denote similarity

Back 32

~ (tilde)

Front 33

examples of shapes that are similar
and
Ones that are ALWAYS SIMILAR

Back 33

straight lines, circles

AND
squares and cubes are ALWAYS SIMILAR

Front 34

similarity definition

Back 34

if 2 images are similar, then by shrinking/enlarging one, the other can be obtained

Front 35

difference between similarity and congruency

Back 35

similarity: same shape

congruent: same shape and size

Front 36

dilation

Back 36

type of transformation that produces an image that is the same shape as the original, but different size.

Front 37

original image is called

Back 37

image

Front 38

new image is called

Back 38

pre image

Front 39

as long as means to

Back 39

multiply

Front 40

more than means to

Back 40

add