Mathematics - Class X Question Paper - Central Board Of Secondary Education Page 31

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Q. No.
Value Points
Marks
SECTION C
Q21. Making the table:
Correct Central angles
2
Activity
Duration in hours
Central angle
0
Sleep
7
105
0
School
8
120
0
Home work
4
60
0
Play
3
45
0
Others
2
30
Drawing correct Pie chart with markings
4
Q22. figure
1
Writing the trignometric equation
b
= tan α Ü x = b cot α
1 ½
x
b + h
b + h
= tan β Ü
= tan β
Again
1
α
x
b cot
b tan β
Ü (b+h) =
1
α
tan
Ü b tan α + h tan α = b tan β
Ü h tan α = b(tan β - tan α)
1
h tan α
Ü b =
½
tan β —tan α
166

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