Question

NEED HELP FAST
question is in the picture attached

Answer 1

x=12.99

h=7.5

Explanation:

• we us cosine rule first to look for OB

the triangle OCB is an isosceles triangle whereby angleOCB=120,angleCOB=angleCBO=30

thus length of BC is 15

`cosine \: rule \\ a {}^(2) = b {}^(2) + c {}^(2) - 2bc \cos(a)`

=(15^2+15^2)-(2×15×15×cos 120)

=450-(-225)

a^2 =675

a=25.98=OB

• finding x

x=15sin 60

=12.99

• finding h

h=15sin 30

=7.5