Major grade eportfolio

Tanisha Pal Singh

3 Dec 2018

1) Cos 67= 18÷ x

0.39= 18÷ x

x= 18÷ 0.39

x= 46.153 feet

2) P^2 + B^2= H^2

x^2 + 13^2 = 17^2

x^2 + 169= 289

x^2= 289- 169

x^2= 120

x= √120

x= 10.954

3) Tan 15= x÷ 22

0.268= x÷22

x= 0.268×22

x= 5.896

4) Sin = 18÷ 25

Sin theta= 0.72

Theta= sin^-1 ( 0.72)

Theta= 46.054

5a) c^2= a^2+ b^2- 2ab× Cos C

c^2= 30^2+ 20^2- 2(30) (20) × Cos 59

c^2= 900+ 400 – 1200× 0.515

c^2= 1300-618

c^2= 682

c= 26.115

5b) a÷ Sin A= c÷ Sin C

30÷ Sin A= 26.115÷ Sin 59

30÷ Sin A= 26.115 ÷ 0.857

Now we are going to cross multiply

0.857×30= 26.115( Sin A)

25.71= 26.115( Sin A)

25.71÷ 26.115=Sin A

0.984= Sin A

Sin ^-1(0.984)= A

79.737°= A

5c) A+ B + C = 180

79.737+ B+ 59= 180

138.737+ B= 180

B=180- 138.737

B= 41.263