alg

Question 1

midpoint formul

Answer 1

x-coordinate: x1+x2 divided by 2
y-coordinate: y1+y2 diviided by 2

Question 2

distance formula

Answer 2

square root of [{x2-x1)^2 + (y2-y1)^2]

Question 3

circle equation (explain variables

Answer 3

(x-h)^2+(y-k)^2 = r^2
r is the radius
(h,k) is the center

Question 4

45 45 90 triangle

Answer 4

legs=1 hypotenuse = sqrt of 2

Question 5

30 60 90 triangle

Answer 5

1, sqrt 3, 2 (in this order for 30,60,90 respectively)

Question 6

sine

Answer 6

o/h

Question 7

cosine (cos)

Answer 7

a/h

Question 8

tangent (tan)

Answer 8

o/a

Question 9

inverse of sin

Answer 9

csc aka cosecant h/0

Question 10

inverse of cos

Answer 10

secant aka sec h/a

Question 11

inverse of tan

Answer 11

cot aka cotangent a/o

Question 12

remember angle of elevation and depression and inverse trig stuff

Answer 12

ok

Question 13

standard position

Answer 13

an angle positioned so that its vertex is at the origin and its initial side is along the positive x-axis

Question 14

initial side

Answer 14

fixed ray of an angle

Question 15

terminal side

Answer 15

a ray of an angle that rotates about the center

Question 16

coterminal angles

Answer 16

2 or more angles in standard position that have the same terminal side

Question 17

there is an – number of coterminal angles

Answer 17

infinite

Question 18

positive angles

Answer 18

start above x-axis and rotate counterclockwise.

Question 19

egative anlges

Answer 19

start below x-axis and rotate clockwise

Question 20

if “find negative coterminal angle of 600 degrees then

Answer 20

keep subtracting 360 until you get a negative number.

Question 21

how do you find coterminal angles.

Answer 21

add and subtract 360

Question 22

degrees to r

Answer 22

multiply deg by pi radians over 180 degrees

Question 23

r to d

Answer 23

multiply number of radians b y 180 over pi radians