Directions: Q. 6 to 10 |
Kavita a student of class 10th, has to made a project on 'Introduction to Trigonometry'. She decides to make a Dog house which is triangular in shape. |
She uses cardboard to make the Dog house as shown in the figure. |
Considering the front side of Dog house as right angled triangle PQR, right angled at R, answer the following questions. |
A) \[\frac{4}{5}\]
B) \[\frac{5}{12}\]
C) \[\frac{3}{5}\]
D) \[\frac{13}{12}\]
Correct Answer: A
Solution :
Given, \[\angle PQR=\theta\] and \[\angle R=90{}^\circ\] |
\[\cos \theta =\frac{QR}{PQ}=\frac{12}{15}=\frac{4}{5}\] |
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