Chapter 8 Vocab

Question 1

Angle of Depression

Answer 1

the angle between the observer’s line of sight and a horizontal line, when the observer is looking down

Question 2

Angle of Elevation

Answer 2

the angle between an observer’s line of sight and a horizontal line, when the observer is looking up

Question 3

45-45-90 Triangle

Answer 3

the length of the hypotenuse is the length of a leg times radical 2

Question 4

Obtuse

Answer 4

c^2>a^2+b^2

Question 5

Pythagorean Triple

Answer 5

when the three whole numbers a, b, and c satisfy the equation a^2+b^2=c^2

Question 6

Trigonometric Ratio

Answer 6

The ratio of the lengths of two sides of a right triangle (sine, cosine, and tangent)

Question 7

30-60-90 Triangle

Answer 7

• the hypotenuse is 2 times the shorter leg
• longer leg is shorter leg times radical 3

Question 8

Right (triangle)

Answer 8

If c^2=a^2+b^2

Question 9

Sine

Answer 9

Opposite divided by hypotenuse
(opposite/hypotenuse)

Question 10

Cosine

Answer 10

Adjacent divided by hypotenuse
(adjacent/hypotenuse)

Question 11

Tangent

Answer 11

Opposite divided by adjacent
(opposite/adjacent)

Question 12

Acute

Answer 12

c^2<a^2+b^2