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# 7.3 Special Angles (45 ? & Quadrantal ) - PowerPoint PPT Presentation

7.3 Special Angles (45  & Quadrantal ). Isosceles Right Triangle. 45 angles w/ hypotenuse = 1 2 sides are equal. 45 . 1. 45 . Memorize!!. Trig Values for 45  . SOH – CAH – TOA. Hyp. Opp. 45. Adj. reciprocals. Trig Values for 180  . x = -1. y = 0. r = 1. 180 .

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### 7.3 Special Angles(45 & Quadrantal)

45 angles w/ hypotenuse = 1

2 sides are equal

45

1

45

Trig Values for 45

SOH –

CAH –

TOA

Hyp

Opp

45

Adj

reciprocals

x = -1

y = 0

r = 1

180

(-1, 0)

reciprocals

Quadrantal Angles

0, 90, 180, 270

90

(0, 1)

0

180

(1, 0)

(-1, 0)

(0, -1)

270

y

237

180

x

237 – 180 =

57

(+) acute

270

135

y

Reference  for 135 is 45

135 is in QII, x is (–), y is (+)

45

x

#707 Pg. 407 41 – 50 all, 60, 64, 65

& Memorize 45 & Quadrantal Angle Trig Values