Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 4)
1
If two sides of a triangle and the included angle are given, which rule is most suitable for finding the third side?
Răspuns
(B)
Cosine Rule
2
If a triangle's area is known along with the lengths of two sides, what trigonometric function can be used to find the angle between those two sides?
Răspuns
(A)
Sine
3
When using the formula Area = 1/2 * ab * sinC, what does 'C' represent?
Răspuns
(B)
The angle opposite side c
4
If in a triangle, a = 7cm, C = 53°, and c = 8cm, how many possible triangles are there?
Răspuns
(C)
2
5
Which of the following are steps to solve a trigonometric problem (in order)?
Răspuns
A
B
C
D
6
In a triangle, given two sides and their included angle, which formula should you use to find the area?
Răspuns
(A)
Area = 1/2 * a * b * sin(C)
7
What formula is used to calculate the area of a triangle when you know two sides and the included angle?
Răspuns
(B)
Area = 1/2 * ab * sinC
8
In the context of finding lengths and angles in 3 dimensions, which method is primarily used?
Răspuns
(B)
Pythagoras' theorem in right-angled triangles
9
If a boat travels 10km from a starting point north and then 6km in a southerly direction, what is the boat's final displacement from the starting point?
Răspuns
(A)
4 km
10
If sinA = 0.6 and angle A is obtuse, what is the value of angle A?
Răspuns
(C)
126.87°
11
If we are given the angle and the length of the hypotenuse, what ratio should we use if we are trying to find the length of the side opposite the angle?
Răspuns
(A)
Sine
12
What is the value of cos(180° - θ) in terms of cos θ?
Răspuns
(B)
-cos θ
13
What rule helps relate the sides of a triangle to the sines of its angles?
Răspuns
(B)
Sine Rule
14
What is the value of sin(30°)?
Răspuns
(B)
0.5
15
What is the general formula for the sine rule?
Răspuns
(A)
a/sinA = b/sinB = c/sinC
16
In the context of a right triangle, what does the term 'opposite' side refer to?
Răspuns
(B)
The side across from the angle being considered
17
Given a triangle where side a = 5 cm, side b = 8 cm, and angle C = 60 degrees, what would be the next step to find the area using Area = 1/2 * ab * sinC?
Răspuns
(C)
Use sine function to calculate sin(60)
18
What steps should you follow when solving a trigonometry question?
Răspuns
A
B
C
19
If the length of the shadow of a vertical pole is equal to the height of the pole, what is the angle of elevation of the sun?
Răspuns
(B)
45 degrees
20
Which formulas is/are correct?
Răspuns
A
B
C
21
What kind of triangle has a line of symmetry?
Răspuns
(C)
Isosceles
22
What is the maximum number of solutions possible in the ambiguous case of the sine rule?
Răspuns
(C)
2
23
Which trigonometric function is the ratio of the adjacent side to the hypotenuse?
Răspuns
(B)
Cosine
24
Which angle has a sine value of 0.5?
Răspuns
(B)
30°
25
If the angle of elevation from point A to the top of a building is 45 degrees, and you are standing 50 meters away from the building, what is the height of the building (assuming a level ground) ?
Răspuns
(B)
50 meters
26
What is the name of the side of a right triangle that is opposite the right angle?
When using the sine rule to solve for an angle in a triangle, what is important to consider?
Răspuns
A
B
29
What is the purpose of using trigonometric ratios (sine, cosine, tangent)?
Răspuns
(B)
To relate the angles of a right triangle to the lengths of its sides
30
What are the ways to remembering SOHCAHTOA?
Răspuns
(B)
Silly Old Harry Can Always Hear The Old Apple Tree Rustle Over
31
What is the value of sin(270°)?
Răspuns
(C)
-1
32
Which trigonometric function is used to find the angle when you know the opposite and adjacent sides?
Răspuns
(C)
Tangent
33
In a triangle, the side opposite the largest angle is:
Răspuns
(B)
The largest side
34
What is the first step in solving a triangle using the Law of Sines, if two angles and a side are given?
Răspuns
(B)
Calculate the third angle
35
What information do you need to solve for the sides of a right triangle using trigonometry?
Răspuns
A
B
36
Which formula(s) correctly represent(s) the Pythagorean theorem?
Răspuns
A
B
C
37
What are the two conditions for using the Pythagorean Theorem?
Răspuns
(B)
Right triangle; know two sides
38
Which of the following scenarios might lead to the ambiguous case when using the sine rule?
Răspuns
(C)
Knowing two sides and an angle opposite one of them.
39
What type of triangle is defined by the Pythagorean theorem?
Răspuns
(C)
Right
40
What do you call the angle between the line of sight and the horizontal when looking up at an object?
Răspuns
(B)
Angle of Elevation
41
What are the two scenarios where you can use the cosine rule?
Răspuns
A
B
42
Which of the following is NOT a real-world application of trigonometry?
Răspuns
(D)
Cooking Recipes
43
In a right triangle, the sine of an angle is 0.5. What is the value of the angle?
Răspuns
(A)
30 degrees
44
If the angle of elevation is 30 degrees, what is the approximate ratio between the opposite side and the adjacent side?
Răspuns
(A)
0.5
45
What is the value of tan(90°)?
Răspuns
(C)
Undefined
46
Which is the law of sines?
Răspuns
(A)
a/sinA=b/sinB=c/sinC
47
What is the hypotenuse of a right-angled triangle?
Răspuns
(A)
The side opposite the right angle
48
Which trigonometric function is the inverse of the sine function?
Răspuns
(A)
Arcsine
49
If the angle of depression from a point A to a point B is 30 degrees, what is the angle of elevation from B to A (assuming they are at different elevations and the ground is flat)?
