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Selina solutions
Grade 9 
Mathematics
Selina Solutions CONCISE subject class 9-ICSE-Maths
Chapter 24- Solution Of Right Triangles
Exercise 24
Question 1
Mathematics
Selina Solutions CONCISE subject class 9-ICSE-Maths
Chapter 24- Solution Of Right Triangles
Exercise 24
Question 1
Chapter 24- Solution Of Right Triangles | Exercise 24
Question 1
CHAPTERS
1. Chapter 1- Rational and Irrational Numbers
2. Chapter 2- Compound Interest [Without Using Formula
3. Chapter 3- Compound Interest [Using Formula
6. Chapter 6- Simultaneous Equations
7. Chapter 7- Indices [exponents]
9. Chapter 9- Triangles [Congruency in Triangles]
10. Chapter 10- Isosceles Triangle
12. Chapter 12- Mid-Point and Its Converse
13. Chapter 13- Pythagoras Theorem
14. Chapter 14- Rectilinear Figures
15. Chapter 15- Construction of Polygons
19. Chapter 19- Mean and Median
20. Chapter 20- Area and Perimeter of Plane Figures
22. Chapter 22- Trigonometrical Ratios
23. Chapter 23- Trigonometrical Ratios of Standard Angles
24. Chapter 24- Solution Of Right Triangles
25. Chapter 25- Complementary angles
26. Chapter 26- Co-ordinate Geometry
- Find 'x' if:
(i)
(ii)
(iii)
(i)
\begin{aligned} \sin 60^{\circ} &=\frac{20}{x} \\ \frac{\sqrt{3}}{2} &=\frac{20}{x} \\ x &=\frac{40}{\sqrt{3}} \end{aligned}
(ii)
\begin{aligned} \tan 30^{\circ} &=\frac{20}{x} \\ \frac{1}{\sqrt{3}} &=\frac{20}{x} \\ x &=20 \sqrt{3} \end{aligned}
(iii)
\begin{aligned} \sin 45^{\circ} &=\frac{20}{x} \\ \frac{1}{\sqrt{2}} &=\frac{20}{x} \\ x &=20 \sqrt{2} \end{aligned}
Chapter 1- Rational and Irrational Numbers
Chapter 2- Compound Interest [Without Using Formula
Chapter 3- Compound Interest [Using Formula
Chapter 6- Simultaneous Equations
Chapter 7- Indices [exponents]
Chapter 9- Triangles [Congruency in Triangles]
Chapter 10- Isosceles Triangle
Chapter 12- Mid-Point and Its Converse
Chapter 13- Pythagoras Theorem
Chapter 14- Rectilinear Figures
Chapter 15- Construction of Polygons
Chapter 20- Area and Perimeter of Plane Figures
Chapter 22- Trigonometrical Ratios
Chapter 23- Trigonometrical Ratios of Standard Angles
Chapter 24- Solution Of Right Triangles
Chapter 25- Complementary angles
Chapter 26- Co-ordinate Geometry
Question 1
- Find 'x' if:
(i)
(ii)
(iii)
(i)
\begin{aligned} \sin 60^{\circ} &=\frac{20}{x} \\ \frac{\sqrt{3}}{2} &=\frac{20}{x} \\ x &=\frac{40}{\sqrt{3}} \end{aligned}
(ii)
\begin{aligned} \tan 30^{\circ} &=\frac{20}{x} \\ \frac{1}{\sqrt{3}} &=\frac{20}{x} \\ x &=20 \sqrt{3} \end{aligned}
(iii)
\begin{aligned} \sin 45^{\circ} &=\frac{20}{x} \\ \frac{1}{\sqrt{2}} &=\frac{20}{x} \\ x &=20 \sqrt{2} \end{aligned}
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