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MEASURING ANGLES IN RADIANS
First, letโs introduce the units you will be using to measure angles, radians.
A radian is a unit of measurement defined as the angle at the center of the circle made when the arc length equals the radius.
If this definition sounds abstract we define the radian pictorially below. Assuming the radius drawn below equals the arc length between the x-axis and where the radius intersects the circle, then the angle ฮ is 1 radian. Note that 1 radian is approximately 57ยฐ.
6.1 Basic Right Triangle
Trigonometry
Many people are more familiar with a degree measurement of an angle. Below is a quick formula for converting between degrees and radians. You may use this in order to gain a more intuitive understanding of the magnitude of a given radian measurement, but for most classes at R.I.T. you will be using radians in computation exclusively.
๐๐๐๐๐๐๐ = ๐๐๐๐๐๐๐
Now consider the right triangle pictured below with sides a,b,c and angles A,B,C. We will be referencing this generic representation of a right triangle throughout the packet.
BASIC FACTS AND DEFINITIONS
- Right angle: angle measuring ๐ 2 radians (example: angle C above)
- Straight angle: angle measuring ฯ radians
- Acute angle: angle measuring between 0 and ๐ 2 radians (examples: angles A and B above)
- Obtuse angle: angle measuring between ๐ 2 and ฯ radians
- Complementary angles: Two angles whose sum is ๐ 2 radians. Note that A and B are complementary angles since C = ๐ 2 radians and all triangles have a sum of ฯ radians between the three angles.
- Supplementary angles: two angles whose sum is ฯ radians
A
B
C
a
b
c
SIMILIAR TRIANGLES
Two triangles are said to be similar if the angles of one triangle are equal to the corresponding angles of the other. That is, we say triangles ABC and EFG are similar if A = E , B = F, and C = G = ๐ 2 radians and we write ๐ด๐ต๐ถ~๐ธ๐น๐บ.
Example 3:
B F
A C E G
๐ด๐ถ ๐ธ๐บ =^
๐ด๐ต ๐ธ๐น =^
๐ต๐ถ ๐น๐บ
Further, the ratio of corresponding sides are equal, that is;
Let AE = 50 meters, EF = 22 meters and AB = 100 meters. Find the length of side BC.
Notice that ABC and AEF are similar since corresponding angles are equal. (There is a right angle at both F and C, angle A is the same in both triangles and angle B equals angle E).
Solution: ๐ด๐ธ ๐ด๐ต = ๐ธ๐น ๐ต๐ถ thus 10050 = (^) ๐ต๐ถ^22
So 50(BC) = (22)(100)
BC = 44 meters
THE SIX TRIGONOMETRIC RATIOS FOR ACCUTE ANGLES
The trigonometric ratios give us a way of relating the angles to the ratios of the sides of a right triangle. These ratios are used pervasively in both physics and engineering (especially the introductory phyiscs sequence at RIT). Below we define the six trigonometric functions and then turn to some examples in which they must be applied.
Example 4 In the right triangle ABC, a = 1 and b = 3. Determine the six trigonometric ratios for angle B.
Example 5:
If the hypotenuse of a ๐ 6 - ๐ 3 - ๐ 2 triangle is 10 meters, what are the lengths of the triangles legs?
Solution:
If 10 = 2x, then x = 5 meters and (^) โ3๐ฅ = โ3(5) = ๐โ๐ meters
Problems
- In right triangle ABC, if side c = 39 (hypotenuse) and side b = 36, find a.
- Given the lengths defined in the right triangle pictured below, find the length of side AC.
- Evauluate: a. sin E = ________ b. tan E = _______ c. cos F = ________ d. sec F = _______
- Evaluate:
- Evaluate:
sin ๐ 6 = __________
sec ๐ 3 = __________
csc
๐ 4 =^ __________
tan ๐ 3 = __________
tan
๐ 4 =^ __________
cot ๐ 6 = __________
a. tan A =_________ b. csc B = __________ c. cot A = _________ d. sec B = __________
