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Topic: BASICS OF TRIGNOMETRYClass:10THAge:15Medium: English
Let’s start module
Programmed Instructional material
Objectives
At the end of this module you will be able :
1. To develop Trigonometrical concepts2.To be able to define trigonometrical ratios3.To be able to distinguish between different ratios of trigonometry
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Let’s start module
BASICS OF TRIGONOMETRY
Trigonometry is the study of sides and angles of a triangle.In a right angled triangle ABC C
A BWe define ratios of triangle:
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TRIGONOMETRIC RATIOS
SIN A =Perpendicular/hypotCOS A=base/hypotenuseTAN A=perpendicular/baseWhere A= AngleCOSEC A=hypotenuse/perpSEC A= hypotenuse/base000COT A=Base/perpendicular
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Clearly ,Cosec A= 1/SIN ASEC A= 1/COS ACOT A= 1/TAN A
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Let’s answer some questions
Q1:Trigonometry is the study of :
-triangles
-circles
-rhombus
-none of above
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B
C
D
A
Oops! Wrong Answer7
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Hint!
Oops! Wrong Answer8
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Hint!
TRI – THREEGON –SIDESMERTRY-MEASURES
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Q2:There are _____ratios in trigonometry
-4
-3
-6
-2
10
B
C
D
A
Oops! Wrong Answer11
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Hint!
Oops! Wrong Answer12
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Hint!
For exampleSIN A is a ratio of trigonometry
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Q3:cot A=Perpendicular/base. This is :
-true
-false
-none
-undefined
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B
C
D
A
Oops! Wrong Answer15
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Hint!
Oops! Wrong Answer16
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Hint!
Cot A =1/TAN A
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Q4:IN Trigonometry, we work on which triangle
-isosceles triangles
-right angled triangle
-equilateral triangles
-none of these
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B
C
D
A
Oops! Wrong Answer19
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Hint!
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Hint!
Tigonometry is the study of three sides and three angles of a triangle angled at 90 degree
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Q5:Trigonometry is the study of :
-angles of triangle
-sides of triangle
-both A & B
-none of above
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B
C
D
A
Oops! Wrong Answer23
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Hint!
Oops! Wrong Answer24
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Hint!
Trigonometry meansTri _threeGon _sidesMetry _ measures
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Click Here to know your score…
Congratulations you have Scored 50 marks!
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