Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3)
1
If the bearing from point X to point Y is 135 degrees, what is the bearing from point Y to point X?
отговор
(C)
225 degrees
2
Which information is required to use the formula for the area of a triangle: 1/2 * base * height?
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(C)
The base and the perpendicular height to that base.
3
What is a key characteristic of all right-angled triangles?
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(B)
One angle measures 90 degrees
4
If a boat sails 4 km on a bearing of 000 degrees and then 3 km on a bearing of 090 degrees, what is the distance of the boat from the starting point?
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(A)
5 km
5
If a ladder leans against a wall and makes an angle of 60° with the ground, and the ladder is 10 meters long, how high up the wall does the ladder reach?
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(B)
8.66 meters
6
Which tools/concepts are necessary for applying the trigonometry ratios?
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A
C
D
7
What are the essential requirements for using the cosine rule to find an angle?
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(B)
All three sides
8
Which rule is typically used when you need to find missing sides and angles in a non-right-angled triangle given two sides and an included angle?
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(C)
Cosine Rule
9
What is the Pythagorean theorem primarily used for?
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(C)
Finding the sides of a right-angled triangle
10
Which of the following statements is/are true when using Pythagoras' Theorem?
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A
B
C
11
What is the value of cos(180°)?
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(C)
-1
12
What is a three-figure bearing and how is it typically expressed?
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(B)
An angle measured clockwise from North, expressed with three digits.
13
If a triangle has sides of 5 cm, 7 cm, and 9 cm, which rule is the most appropriate to determine the angles?
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(B)
The Cosine Rule
14
What is the main purpose of using three-figure bearings?
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(B)
To indicate a specific direction
15
What is a three-figure bearing?
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(A)
An angle measure clockwise from the north direction
16
In a non-right angled triangle, with sides a,b and c and the angles opposite them A, B and C, which formula represents the cosine rule correctly?
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(A)
a²=b²+c²-2bc cos A
17
What is the approximate value of the angle θ (in degrees) if tan(θ) = 1.732?
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(C)
60°
18
What does 'TOA' stand for in SOH CAH TOA?
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(B)
Tangent = Opposite / Adjacent
19
If two sides of a triangle are 5 cm and 12 cm, and the angle between them is 30 degrees, what is the area of the triangle?
отговор
(C)
15 cm²
20
In a right-angled triangle, if you know one acute angle and the length of one side, what can you find?
отговор
A
B
C
21
Which statement correctly describes a bearing?
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(A)
It is an angle measured clockwise from North.
22
If a boat travels 5km on a bearing of 060 degrees and then 7km on a bearing of 150 degrees, what geometrical shape describes the boat's path?
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(C)
An obtuse angle
23
If you are given an angle and the adjacent side of a right triangle, which trigonometric function is best to find the opposite side?
отговор
(C)
Tangent
24
What is the formula for Pythagoras' theorem?
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(B)
a^2 + b^2 = c^2
25
To find the area of any triangle given two sides and an included angle, which of the following formulas can be used?
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(B)
Area = 1/2 * ab * sin C
26
Which of the following are true about the Cosine Rule?
отговор
A
B
D
27
Which rule is best when you know two sides and the included angle of a non-right triangle and want to find the length of the third side?
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(C)
Cosine Rule
28
In the context of a three-dimensional rectangular prism, what formula is used to calculate the length of the diagonal?
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(B)
d = √(a² + b² + c²)
29
What is the formula for finding the area of a triangle if two sides, *a* and *b*, and the *included* angle *C* are known?
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(C)
Area = 1/2 * a * b * sin C
30
Which trigonometric function is defined as the ratio of the opposite side to the hypotenuse in a right-angled triangle?
отговор
(A)
Sine
31
If the distance from a point on the ground to the base of a building is 50 meters and the angle of elevation to the top of the building is 45 degrees, what is the height of the building?
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(B)
50 meters
32
What is the primary goal of trigonometry?
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(B)
To study the relationships between the sides and angles of triangles.
33
If you know the angle and the hypotenuse of a right triangle, which trigonometric ratio can you use to find the length of the opposite side?
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(A)
Sine
34
Which of the following rules can be utilized to determine the area of any given triangle?
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(D)
All of the above
35
If you know two sides of a right triangle, which theorem can you use to find the third side?
отговор
(C)
Pythagorean Theorem
36
What is the value of tan(0°)?
отговор
(A)
0
37
If the bearing from A to B is 180 degrees, what is the direction of B from A?
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(B)
South
38
In the context of the cosine rule, what is the formula for finding the angle A in a triangle with sides a, b, and c?
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(A)
cos A = (b² + c² - a²) / (2bc)
39
Which of the following statements is/are correct about the relationships in a right-angled triangle?
отговор
A
B
C
40
If the hypotenuse of a right triangle is 10 and one leg is 6, what is the length of the other leg?
отговор
(B)
8
41
Which of the following is a valid application of the cosine rule: a² = b² + c² - 2bc cos A?
отговор
A
B
C
42
If you are given the lengths of all three sides (a, b, and c) of a triangle, what can you directly calculate using the Cosine Rule?
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(A)
The angles of the triangle.
43
What does the abbreviation 'CAH' represent in the mnemonic SOH CAH TOA?
отговор
(A)
Cosine Adjacent Hypotenuse
44
If cos(θ) = 0.8, what is θ (approximately)?
отговор
(A)
36.9°
45
If the sides of a right-angled triangle are 6cm and 8cm, what is the hypotenuse?
отговор
(A)
10cm
46
Which of the following statements are true about the angles of elevation and depression?
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A
C
47
What is the value of cos(0)?
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(B)
1
48
In a triangle, which of the following scenarios allows you to directly apply the cosine rule?
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A
B
49
If sin(A) = sin(B) and A and B are angles in a triangle, what can be concluded about the relationship between A and B?
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(D)
A and B are supplementary, or A=B
50
What does the term 'bearing' refer to in navigation?
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(B)
The direction of travel, measured as an angle from North.
