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?
Answer
(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?
Answer
(A)
Sine
3
When using the formula Area = 1/2 * ab * sinC, what does 'C' represent?
Answer
(B)
The angle opposite side c
4
If in a triangle, a = 7cm, C = 53°, and c = 8cm, how many possible triangles are there?
Answer
(C)
2
5
Which of the following are steps to solve a trigonometric problem (in order)?
Answer
A
B
C
D
6
In a triangle, given two sides and their included angle, which formula should you use to find the area?
Answer
(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?
Answer
(B)
Area = 1/2 * ab * sinC
8
In the context of finding lengths and angles in 3 dimensions, which method is primarily used?
Answer
(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?
Answer
(A)
4 km
10
If sinA = 0.6 and angle A is obtuse, what is the value of angle A?
Answer
(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?
Answer
(A)
Sine
12
What is the value of cos(180° - θ) in terms of cos θ?
Answer
(B)
-cos θ
13
What rule helps relate the sides of a triangle to the sines of its angles?
Answer
(B)
Sine Rule
14
What is the value of sin(30°)?
Answer
(B)
0.5
15
What is the general formula for the sine rule?
Answer
(A)
a/sinA = b/sinB = c/sinC
16
In the context of a right triangle, what does the term 'opposite' side refer to?
Answer
(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?
Answer
(C)
Use sine function to calculate sin(60)
18
What steps should you follow when solving a trigonometry question?
Answer
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?
Answer
(B)
45 degrees
20
Which formulas is/are correct?
Answer
A
B
C
21
What kind of triangle has a line of symmetry?
Answer
(C)
Isosceles
22
What is the maximum number of solutions possible in the ambiguous case of the sine rule?
Answer
(C)
2
23
Which trigonometric function is the ratio of the adjacent side to the hypotenuse?
Answer
(B)
Cosine
24
Which angle has a sine value of 0.5?
Answer
(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) ?
Answer
(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?
Answer
A
B
29
What is the purpose of using trigonometric ratios (sine, cosine, tangent)?
Answer
(B)
To relate the angles of a right triangle to the lengths of its sides
30
What are the ways to remembering SOHCAHTOA?
Answer
(B)
Silly Old Harry Can Always Hear The Old Apple Tree Rustle Over
31
What is the value of sin(270°)?
Answer
(C)
-1
32
Which trigonometric function is used to find the angle when you know the opposite and adjacent sides?
Answer
(C)
Tangent
33
In a triangle, the side opposite the largest angle is:
Answer
(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?
Answer
(B)
Calculate the third angle
35
What information do you need to solve for the sides of a right triangle using trigonometry?
Answer
A
B
36
Which formula(s) correctly represent(s) the Pythagorean theorem?
Answer
A
B
C
37
What are the two conditions for using the Pythagorean Theorem?
Answer
(B)
Right triangle; know two sides
38
Which of the following scenarios might lead to the ambiguous case when using the sine rule?
Answer
(C)
Knowing two sides and an angle opposite one of them.
39
What type of triangle is defined by the Pythagorean theorem?
Answer
(C)
Right
40
What do you call the angle between the line of sight and the horizontal when looking up at an object?
Answer
(B)
Angle of Elevation
41
What are the two scenarios where you can use the cosine rule?
Answer
A
B
42
Which of the following is NOT a real-world application of trigonometry?
Answer
(D)
Cooking Recipes
43
In a right triangle, the sine of an angle is 0.5. What is the value of the angle?
Answer
(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?
Answer
(A)
0.5
45
What is the value of tan(90°)?
Answer
(C)
Undefined
46
Which is the law of sines?
Answer
(A)
a/sinA=b/sinB=c/sinC
47
What is the hypotenuse of a right-angled triangle?
Answer
(A)
The side opposite the right angle
48
Which trigonometric function is the inverse of the sine function?
Answer
(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)?
