Loading [MathJax]/jax/output/HTML-CSS/fonts/TeX/fontdata.js

SChand CLASS 9 Chapter 19 Trigonometric Ratios Exercise 19(A)

 

 Exercise 19 A 


Question 1

Ans: θ= perpendicular  Bare cosθ= base  Hypotenuse sinθ= perpendicular  Hypotenuse cotθ=1tanθ= Base  [Perpendicular secθ=1cosθ= Hypotenuse  Bare  ard cosecθ=1sinθ= Hypotenuse  Perpendicular 
Now, we shall complete the give

(IMAGE TO BE ADDED)

Question 2

Ans: AB=5,BC=12 and hyp. . AC=13 and ACB=θ
 So sinθ=ABAC=513cosθ=BCAC=1213tanθ=ABBC=512sin2θ=|513|2=25159cos2θ=|1215|2=144169tan2θ=(512)2=25144

Question 3

Ans: ABC=θ and C=90
AB=5BC=3 and AC=4
So tanθ=ACBC=43
tan2θ=(43)2=169
tan3θ=(43)2=6427
if sinθ=ACAB=45
So sin3θ=(45)2=64125
and cosθ=DCAB=35
So cos3θ=(35)3=27125

Question 4

Ans: In the Figure
OMP, ORO and OOM
(a) sinRQM=RMQM (b) sinQMP=POPM
(c) sinOQK=OROQ (d) \CosQmP=QMPm
(e) tanRQm=RmQR (f) \Cot MOP =ommp
(g) SecROQ=OQOR.





No comments:

Post a Comment

Contact Form

Name

Email *

Message *