Discussion on: Plane Trigonometry

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Jaywelle T. Galagar
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Discussion on: Plane Trigonometry

Following is a discussion on the Reviewer item titled: Plane Trigonometry.
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Jaywelle T. Galagar
Jaywelle T. Galagar's picture

a clock has a minute hand 16 cm long and an hour hand 11 cm long. find the distance between the outer tips of the hand at 2:30 o'clock?. . help me

joelitomath1971
joelitomath1971's picture

After sketching a diagram for the problem, you will see that you are dealing with an oblique triangle. Let a=11 cm, b=16 cm, C=105 degrees. You are actually solving for c (the length of the third side of the triangle, which is also the distance between the outer tips of the hands of the clock).
You may now use the Law of Cosines to solve for c. Use the formula: c=a^2+b^2-2ab cos⁡C.
Substituting the values,c =〖(11)〗^2+〖(16)〗^2-2(11)(16) cos⁡〖〖105〗^o 〗. Please figure out what is the final answer. The final unit is in cm. Hope this helps... Good luck!

joelitomath1971
joelitomath1971's picture

I hope this helps...Please post some other problems you might need help with. And I hope you pass your Trig class.

markee22
markee22's picture

anu bang sagot yan sayo? kasi ang na compute ko ay 26.080 cm

Arnel Corpuz
Arnel Corpuz's picture

21.635

anmol agarwal
anmol agarwal's picture

Angle b/w the hands = 180-75=105°

Now looking to it as a triangle with 2 sides 16 and 11 cm and angle b/w them as 105°

By cosine formulae

Cos 105=(16^2+ 11^2-x^2)/(2*16*11)

(-0.259)=(377- x^2)/(352)

x^2=468.17

x=21.63

Hence solved

Hope its correct and understood

Arnel Corpuz
Arnel Corpuz's picture

21.635

Kevin M. Evangelista
Kevin M. Evangelista's picture

Like..

jasmin reyes

hi

Melbourne Barber
Melbourne Barber's picture

sir who can help me with my problem in spherical triangle??

Charlon Jay N Unabia
Charlon Jay N Unabia's picture

sir can you help me with my assignment?

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