Math 9 – 4th Quarter Exam Pointers to Review Quiz

How can you find the value of a given trigonometric ratio in special angles?

• Guess the answer

• Draw the angle on paper

• Type it into your scientific calculator

• Use a protractor

Answer explanation

To find the value of a given trigonometric ratio in special angles, you should type it into your scientific calculator.

What is the value of sin 30°?

• 0.5

• 1

• 0.25

• 2

Answer explanation

The value of sin 30° is 0.5. In trigonometry, sin 30° is equal to 1/2 or 0.5.

What should you do if the answer is a decimal when finding trigonometric ratios?

• Click SD on your scientific calculator

• Round it down

• Round it up

• Ignore the decimal

Answer explanation

Click SD on your scientific calculator

What is the purpose of the 4th periodical exam?

• To review the lessons

• To introduce new topics

• To have a break

• To play games

Answer explanation

The purpose of the 4th periodical exam is to review the lessons, not to introduce new topics, have a break, or play games.

What should you do after the exam?

• Study the lesson again

• Forget everything

• Go on vacation

• Never return to class

Answer explanation

Study the lesson again

What is the value of cos 45°?

• 0

• 1

• 0.5

• 2

Answer explanation

The value of cos 45° is 0.5. In trigonometry, the cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse in a right triangle with that angle.

What symbol should you click on your scientific calculator if the answer is a decimal?

• RD

• SD

• CD

• PD

Answer explanation

To indicate that the answer is a decimal on a scientific calculator, you should click on the 'SD' symbol. 'SD' stands for Standard Decimal.

What is the value of tan 60°?

• 1

• 0.5

• 2

• √3

Answer explanation

The value of tan 60° is √3. In a 30-60-90 triangle, tan 60° is equal to √3.

What is the value of sin 45°?

• 0.5

• 1

• 0

• 2

Answer explanation

The value of sin 45° is 0.5. This is a standard trigonometric value that represents the sine of a 45-degree angle.

What is the value of cos 30°?

• 0.5

• 1

• 0

• 2

Answer explanation

The value of cos 30° is 0.5. In a right triangle with a 30° angle, the cosine of 30° is the ratio of the adjacent side to the hypotenuse, which is 0.5.