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trigonometry grade 9 Flashcards | StudBud
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trigonometry grade 9
trigonometry grade 9
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Answers
1
Using a calculator: given two sides, find an angle
all are correct
shift tan ratio
shift sin ratio
shift cos ratio
2
Trigonometry involves
referring to angles
dividing the measurements of the sides by each other
all of the above
measuring sides
3
the cos ratio uses
x and r
y and r
y and x
x and y
4
If you have the angle and the opposite side, you can use all trigonometric functions
except (
a)
Sin
Arc Tan
Cos
Tan
5
cos90
0
=
0
1
0,866
1/2
6
What is the Trigonometric ratio of cos C?
12/13
5/12
5/13
12/5
7
Right triangle trigonometry can be used for ____________ .
determining the height of the man
finding the length of a branch using an angle and hypotenuse
finding where the sun is
determing the height of a tree using its shadow and an angle
8
For the triangle below, decide which trigonometric ratio (i.e. sin, cos or tan) you would use?
Cos
Tan
Sin
Nat
9
Do you use Pythagoras' theorem or trigonometry to find x?
Pythagoras
Trigonometry
Either
10
What are the three ratios used in trigonometry?
sin, cos, tan
a2 + b2 = c2
sos, can, tin
11
The INPUT into an inverse trigonometric function is a/an ___________.
angle
ratio
12
sin90
0
=
1
0,5
0
0,866
13
What is the mnemonic used to remember the trigonometric ratios?
SAHCOHTAO
SAHCOHTOA
SOHTOACAH
SOHCAHTOA
14
Find the value of each trigonometric ratio.
25:7
25:24
7:25
24:25
15
sin30
0
=
0
0,5
0,866
1
16
the trig ratio sin uses
adjacent side and hypotenuse
opposite side and hypotenus
opposite side and adjacent side
pythagoras
17
For the triangle below, decide which trigonometric ratio (i.e. sin, cos or tan) you would use?
Cos
Tan
Sin
Nat
18
Jack stands 5 metres from a tree. He looks up to the top of the tree at an angle of 67
0
. height of tree?
12 metres
2 metres
10 metres
13 metres
19
sin60
0
= cos30
0
True
False
20
Trigonometry
deals with things like circumference and radii.
all answers are correct
defines relations between elements of a triangle.
is a more advanced way to interpret polynomials.
21
28. Write the trigonometric ratio for cosX
cosX=9/15=0.60
cosX=12/15=0.80
cosX=9/12=0.75
cosX=12/9≃1.33
22
Find the value of the trigonometric ratio.
4/3
3/4
4/5
3/5
23
Find the value of the trigonometric ratio.
8/17
15/17
8/15
15/8
24
What trigonometric function is the ratio of two other trigonometric functions?
tan
sec
sin
cos
25
What is the trigonometric ratio for the tan A?
3/5
4/5
3/4
5/3
26
sinƟ = 0,5
Ɵ = 250
Ɵ = 600
Ɵ = 300
Ɵ = 900
27
For the triangle below, decide which trigonometric ratio (i.e. sin, cos or tan) you would use?
Tan
Nat
Cos
Sin
28
Trigonometry is the study of the relationship between lengths and angles of geometrical figures.
True
False
29
Find the value of each trigonometric ratio to the nearest ten-thousandth.
0.7431
0.0000
0.0698
0.1392
30
cos90
0
= sin0
0
False
True
31
If you have the angle and the hypotenuse, you can use all trigonometric functions
except
Sin
Cos
Tan
Arc Tan
32
What can we use to remember the trigonometric ratios?
SOH TAH COA
SOH CAH TOA
SHO CHA TOA
CHA CHA CHA
