Trigonometry Ratios
Class 10 Maths: introduction to trigonometry
Change the angle of a right triangle and watch sin, cos and tan change. Find the special angles 30°, 45° and 60°.
Words to know
- Hypotenuse
- The longest side of a right triangle, opposite the right angle.
- Opposite side
- The side facing the angle θ.
- Adjacent side
- The side next to θ that is not the hypotenuse.
- sin, cos, tan
- Ratios of sides: opposite/hypotenuse, adjacent/hypotenuse, opposite/adjacent.
Quick check
Answer 3 questions to check what you learned.
Try at home
Lean a ruler against a wall. Measure how high it reaches and how far its foot is from the wall. Divide height by distance: that is tan of the angle with the floor.