Basic Trigonometry Sohcahtoa

SOHCAHTOA is...

• an acronym for how we feel about mathematics.

• an mnemonic device to help us identify the three basic trigonometry ratios; sine; cosine and tangent.

• the American Indian way of spelling trigonometry.

• an mnemonic device to describe the formula for finding the area of a triangle.

Answer explanation

When your trigonometry formula put the 'x' on the bottom of a fraction...

• Flip the fraction; now the 'x' is on top!

• Don't move anything; the calculator can work it out.

• Move the 'x' to the other side of the equals sign and then use the calculator.

• Move the 'x' to the other side of the equals sign and then move the angle ratio to the bottom of that fraction.

Answer explanation

sin A = ?

• 7/25

• 24/25

• 7/24

• 25/7

Which trigonometric ratio should you use?

• Tangent Ratio

• Sine Ratio

• Cosine Ratio

• Any ratio

TANGENT = ​ (a)   /​ (b)  

• Opposite

• Adjacent

• Hypotenuse

What is trigonometry?

• The study of triangles.

• The study of squares.

• The study of pentagons.

• The study of heptagons.

Find the height(h)?

• 2000

• 50

• 500

• 1732.05

SINE = ​ (a)   /​ (b)  

• Opposite

• Hypotenuse

• Adjacent

COSINE = ​ (a)   /​ (b)  

• Adjacent

• Hypotenuse

• Opposite

What leg is considered the hypotenuse?

• Any side

• the side opposite the smallest angle

• the side opposite the right angle

• the side opposite the shortest leg