Page 1 - Worksheet-1 Ch-8 Introduction to trigonometry

SAI International School
CLASS - X

Mathematics

CHAPTER-8 : Introduction to trigonometry
Worksheet -1

Select the most appropriate answer from the given options.

1 The maximum value of sin is: 1 mark
1 3 1
(A) (B) (C) 1 (D)
2 2 2

2 1 mark
o

If sec2A  cosec(A 27 ) where 2A is an acute angle, then the
measure of  A is:
(A) 35 o (B)37 o (C) 39 o (D) 21 o

3  A B  1 mark

If A, B and C are interior angles of a  ABC, then tan   equals:
 2 
 C   C   C   C 
(A) sin   (B) cos   (C) cot   (D) tan  
 2   2   2   2 

4 3sin 20  2 tan 45  3sin 70 is equal to:
o
o
2
2
2
o
(A) 0 (B) 1 (C) 2 (D) – 1
Answer the following:
5 3 1 mark
In  ABC right angled at B and cot A  . If AC = 10 cm, find the length
4
of AB .

6 Find the value of  for which 2sin 2  3 ., where 2 is an acute angle. 1 mark