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Mathematics Grade 9 Unit 5: INTRODUCTION TO TRIGONOMETRY
national exam questions have come from this unit. It runs 22 pages; one careful study pass takes about 1.7 hours, and its difficulty is moderate among Mathematics units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.
5.1 Revision on Right-angled Triangles · read p. 185
Not asked in a national paper yet.
5.2 Trigonometric Ratios · read p. 185
- 2018 E.C., Q34 – The two consecutive sides of a parallelogram are $3\,\text{m}$ and $4\,\text{m}$ long and the angle between them is $30^\circ$. Then what is the area of the parallelogram?
- 2018 E.C., Q27 – Consider the rhombus ABCD as shown in the figure below, where AC = 6 units and BD = 8 units. Then which one of the following statements is true about the above rhombus? m(∠DAB) = m(∠OBA) + m(∠ODA)
- 2017 E.C., Q64 – Consider the diagram below: ABCD is a parallelogram with length of base 7 cm and $\triangle APB$ is an isosceles right angled triangle with right angle at P and hypotenuse 4 cm. What is the area of ABCD in cm$^2$?
- 2015 E.C., Q29 – If $f$, $g$, $h$, and $m$ are functions defined by $f(x)=\frac{x+7}{x^2+9x+14}$, $g(x)=\frac{\cos x}{\sqrt{x}}$, $h(x)=\sqrt{\frac{5x-1}{x-3}}$, and $m(x)=\frac{\sin x \cos x}{x}$, which one of the following is the corre
- 2014 E.C., Q41 – Which of the following is true about the trigonometric values of the given pairs of angles?
- 2013 E.C., Q24 – Which of the following is true?