Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 5)
1
Which trigonometric ratio is defined as Opposite/Hypotenuse?
Answer
(A)
Sine
2
What is the range of the sine function?
Answer
(A)
-1 to 1
3
What is the name of the inverse trigonometric function for cosine?
Answer
(A)
Arccosine
4
If you have a triangle with sides 6cm, 8cm and angle between the two is 60 degrees, what is the length of the third side?
Answer
(B)
4.0cm
5
If you are given an angle of 150 degrees, what angle should you use to determine its value with your calculator, or using sin, cos, and tan?
Answer
(B)
30 degrees
6
Which trigonometric concept is essential for expressing direction in terms of a three-figure bearing?
Answer
(A)
Angle Measurement
7
What does the abbreviation 'SAS' stand for in the context of the Cosine rule?
Answer
(A)
Side Angle Side
8
What information is required to solve for the unknown angles using the Cosine rule?
Answer
(B)
All three sides
9
If the angle between sides a and b is 90 degrees, what simplified formula could be used for the area of a triangle?
Answer
(A)
Area = 1/2 * a * b
10
If you know the height of a building and the angle of elevation to its top, which trigonometric function should you use to find the distance from you to the building?
Answer
(C)
Tangent
11
If a person walks 5km on a bearing of 000 degrees, and then 12km on a bearing of 090 degrees, what is the direct distance to the original start position?
Answer
(B)
13km
12
If you are given two sides of a triangle and the angle *not* included between them, which trigonometric rule should be applied?
Answer
(B)
The Sine Rule
13
Which of the following statements is correct about using SOH CAH TOA?
Answer
(D)
All of the above.
14
What type of measurement is used to express the position of a point using bearings?
Answer
(B)
An angle
15
Which of the following best describes the angle of depression?
Answer
(B)
The angle measured from the horizontal down to the line of sight to an object.
16
How is the area of a triangle best computed when two sides (a and b) and the angle (C) between them are given?
Answer
(C)
Area = 1/2 * a * b * sin(C)
17
What is the value of tan(45°) ?
Answer
(C)
1
18
When you are given two sides and one non-included angle of a triangle, and using the Law of Sines, what should you watch out for?
Answer
C
D
19
If the angle of depression from a point A to a point B is 30°, what is the angle of elevation from point B to point A?
Answer
(A)
30°
20
Which side of a right-angled triangle is the longest?
Answer
(C)
Hypotenuse
21
If the angle of elevation of the top of a tower from point A is 30°, and the distance from A to the base of the tower is 20 meters, what is the height of the tower?
Answer
(B)
20√3/3 m
22
In the context of finding the height of a triangular prism, what is the initial step?
Answer
(C)
Form a right-angled triangle.
23
What is the relationship between the sine and cosine of an angle?
Answer
(C)
They are complementary in right-angled triangles.
24
In a right-angled triangle, what is the relationship between the sides and the angles?
Answer
(B)
Trigonometric ratios relate sides and angles.
25
What is the key function of trigonometry?
Answer
(B)
Studying the relationship between angles and side lengths in triangles.
26
Which components are needed to calculate unknown sides in a right triangle problem?
Answer
A
C
D
27
Which of the following scenarios is best suited to applying the Cosine Rule directly?
Answer
(D)
You have all three sides.
28
Which of the following represents the correct application of the Pythagorean theorem?
Answer
(C)
a^2 + b^2 = c^2
29
If two sides of a triangle are 5 and 12, and the included angle is 90 degrees, what is the length of the third side?
Answer
(B)
13
30
What is the formula for area of triangle, if you know only two sides and one angle?
Answer
(A)
1/2 * a * b * sin C
31
What is the value of sin(0°)?
Answer
(A)
0
32
The term 'SOH' in the SOH CAH TOA mnemonic helps to remember which trigonometric ratio?
Answer
(B)
Sine = Opposite/Hypotenuse
33
What is the first step in solving problems using trigonometric ratios?
Answer
(B)
Draw a clearly labeled diagram.
34
What information is necessary to apply the formula A = 1/2 * a * b * sin(C) for finding the area of a triangle?
Answer
A
B
35
In a right-angled triangle, what is the relationship between the hypotenuse and the other two sides according to the Pythagorean theorem?
Answer
(B)
Hypotenuse² = Sum of the squares of the other two sides
36
In a right-angled triangle, which side is *adjacent* to a given angle (other than the right angle)?
Answer
(C)
The side next to the angle, not the hypotenuse
37
Which of the following is NOT a correct statement?
Answer
(C)
cos(180° - θ) = cos θ
38
Which trigonometric ratio uses the adjacent side and the hypotenuse?
Answer
(B)
Cosine
39
What is the inverse operation of the sine function called?
Answer
(C)
Arcsine
40
Which of the following best describes the concept of bearing?
Answer
(B)
The angle measured clockwise from north
41
What is the purpose of the Law of Cosines?
Answer
(B)
To determine the relationship between sides and angles.
42
Which of the following can be used to determine the size of the angle?
Answer
A
B
C
43
Which trigonometric function is used to find the angle of elevation or depression?
Answer
(D)
All of the above
44
If the bearing of point B from point A is 225°, what direction is point B from point A?
Answer
(B)
South West
45
Which statement is always true in any triangle?
Answer
(A)
The longest side is opposite the largest angle.
46
What is the formula for the Pythagorean Theorem?
Answer
(B)
a^2 + b^2 = c^2
47
What is the value of sin(180° - θ) in terms of sin(θ)?
Answer
(B)
sin θ
48
Which trigonometric function relates the adjacent side and the hypotenuse?
Answer
(B)
Cosine
49
Which trigonometric ratio is defined as the adjacent side divided by the opposite side in a right-angled triangle?
Answer
(D)
Cotangent
50
Which tools are useful to solve problems involving angles of elevation and depression?
