Question

The hands of a clock are 4cm and 5cm long. Find the distance b/w the tips of the hands at 16.00h
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ANSWER = 7.81cm

Answer 1

what is 16.00h ??

Answer 2

4pm

Answer 3

oh!

Answer 4

am i drawin the figure right??

Answer 5

You have a triangle, and know one of the angles and two of the side lengths. You can probably use the sine rule here.

Answer 6

4/12 or 1/3rd, since the angle is 1/3rd of 360 degrees at 4pm.

Oh you'll probably need the cosine rule actually.

Answer 7

http://www.mathsisfun.com/algebra/images/trig-cosine-law-c.gif

Answer 8

what is the formula??

Answer 9

c^2=a^2+b^2-2ab. cos gamma

Answer 10

is this the formula??

Answer 11

what is gamma??

Answer 12

1/3 ??

Answer 13

I posted it up there: http://www.mathsisfun.com/algebra/images/trig-cosine-law-c.gif

Answer 14

what is the value of C ??

Answer 15

There is no gamma...

Answer 16

C is the angle. 1/3rd of a circle, or 1/3rd of 360 degrees.

Answer 17

c^2=(5)^2+(4)^2-2*5*4*cos(1/3)

Answer 18

The angle is not 1/3. The angle is 1/3rd of 360 degrees.

Answer 19

120 ??

Answer 20

Correct.