Trigonometry 1 - [Pure 2].

Question 1

What angles between is an Acute Angle?

Answer 1

0° and 90°.

Question 2

What angles between is an Obtuse Angle?

Answer 2

90° and 180°.

Question 3

What angles between is an Reflex Angle?

Answer 3

180° and 360°.

Question 4

What equation is used for the Sine Rule to find a missing length?

Answer 4

a/sinA = b/sinB = c/sinC.

Length on numerator, angle on the denominator.

Question 5

What equation is used for the Sine Rule to find a missing angle?

Answer 5

sinA/a = sinB/b = sinC/c.

Angle on Numerator, Length on the Denominator.

Question 6

What equation is used for the Cosine Rule to find a missing length?

Answer 6

a² = b² + c² - 2bc x cosA.

Question 7

What equation is used for the Cosine Rule to find a missing angle?

Answer 7

cos(A) = b² + c² - a² / 2bc.

Question 8

What is the equation used for the Area of a Traingle?

Answer 8

1/2(a)(b) x sin(C).

Question 9

How do you convert from Degrees to Radians?

Answer 9

• 360° = 2π.
• 180° = π.
• 1° = π/180.
• θ x π/180.

Question 10

How do you convert from Radians to Degrees?

Answer 10

• 2π = 360°.
• π = 180°.
• 1^c = 180/π.
• θ x 180/π.

Question 11

What is the equation used for the Arc Length?

Answer 11

l = rθ.