Unit 2 – Triangle TrigonometrySection 2.1 – Right Triangle Trigonometry

Calculator Required

a

b

ca

b

c

a

b

c

c 90

a

b

3 Decimal Places3 Decimal Places

a

b

cOPP

ADJ

HYP

a

b

c

OPP

ADJ HYP

OPP ADJ OPPsin cos tan

HYP HYP HYP

SOH - CAH - TOA

Sides in A, B, C3 Decimal Places

Angles in D, E, F3 Decimal Places

a

b

ca 6

b 8

90c

6 STO ALPHA A

8 STO ALPHA B

90 STO ALPHA F

2 2 2A B C 2 2A B C

( ALPHA A 2x + ALPHA B 2x ENTER

10

STO ALPHA C

10

a

b

ca 6

b 8

90c

10

opp

adj

Atan

B

1 Atan

B

2nd tan ( A ENTERB

STO Alpha D ENTER

36.870

a

b

ca 6

b 8

90c

10

36.870

180 - ENTERALPHA D - ALPHA F

53.130

a

b

ca

b 7.13

c 11.77 90

7.13 STO ALPHA B

11.77 STO ALPHA C

90 STO ALPHA F

2 2 2A B C 2 2A C B

( ALPHA C 2x - ALPHA B 2x ENTER

STO ALPHA A

9.364

a

b

ca

b 7.13

c 11.77 90

9.364opp

hyp

Bsin

C

1 Bsin

C

2nd sin ( B ENTERC

37.285

180 - ENTERALPHA E - ALPHA F

52.715

a

b

ca 8.12

b 71.483

c 90

8.12 STO ALPHA A

71.483

90 STO ALPHA F

STO ALPHA E

180 - ENTERALPHA E - ALPHA F

STO Alpha D ENTER

18.517

a

b

ca 8.12

b 71.483

c 90

18.517opp

adj

btanE

A

A tanE b

tan ENTERALPHA A ALPHA E

STO Alpha B ENTER

24.244

2 2 2A B C 2 2C A B

( ALPHA A 2x + ALPHA B 2x ENTER

25.568

a

b

ca

b 4.71 38.483

c 90

4.71 STO ALPHA B

38.483

90 STO ALPHA F

STO ALPHA E

180 - ENTERALPHA E - ALPHA F

STO Alpha D ENTER

51.517

a

b

ca

b 4.71 38.483

c 90

51.517opp

adj

BtanE

a

Ba

tanE

5.925

2 2 2A B C 2 2C A B

7.569