JCHL Trigonometry

Junior Cycle Higher Level Maths JCHL Trigonometry

JCHL Trigonometry

Your progress through this topic0 of 6 lessons

Lessons in this topic

All 6 lessons.

1Pythagoras Theorem2SOHCAHTOA (Finding the Angle)3SOHCAHTOA (Finding the side)4Sketching a Right Angled Triangle5Degrees, Minutes and seconds6Sin(A) = Cos (90-A)

Key ideas in this topic

Every formula from these lessons in one place. The green ones are printed in the log tables booklet you get in the exam — the red ones you learn off.

📖 In the log tables
Pythagoras Theorem
Pythagoras TheoremJCHL Trigonometry 1
📖 In the log tables
Angle
AngleJCHL Trigonometry 2
📖 In the log tables
SOHCAHTOA
SOHCAHTOA

Straight off page 16 of your maths tables. A is the angle you are working with, a is the side OPPOSITE it, b is the side beside it (ADJACENT) and c is the HYPOTENUSE — the longest side, opposite the right angle.

JCHL Trigonometry 2

★ Must learn
Angle of elevation
Angle of elevation

How far you look UP from the flat (horizontal) to something above you.

JCHL Trigonometry 2

★ Must learn
Angle of depression
Angle of depression

How far you look DOWN from the flat (horizontal) to something below you.

JCHL Trigonometry 2

★ Must learn
How big can sin and cos get?

The sin and the cos of an angle are always between −1 and 1. tan has no such limit — it can be any value at all.

JCHL Trigonometry 2

★ Must learn
Sin(A) = Cos (90-A)
Sin(A) = Cos (90-A)JCHL Trigonometry 6
★ Must learn
Sin(A) = Cos (90-A)
Sin(A) = Cos (90-A)JCHL Trigonometry 6

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