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Mathematics 20 Online
OpenStudy (anonymous):

What is the length of AB?

OpenStudy (anonymous):

What is the length of AB?

OpenStudy (saifoo.khan):

We will use sin ratio to find the sides.

OpenStudy (anonymous):

I dont know how to do that actually

OpenStudy (saifoo.khan):

Wait we will use tan. Tan theta = opposite/adjacent.

OpenStudy (saifoo.khan):

tan(30) = 10/adjacent. adjacent = 10/tan(30)

OpenStudy (anonymous):

For adjacent i got 17.3 ?

OpenStudy (saifoo.khan):

Yes.

OpenStudy (saifoo.khan):

AB = 17.3

OpenStudy (anonymous):

Thank you !!

OpenStudy (saifoo.khan):

Np

OpenStudy (anonymous):

buuuut thats not one of my options lol

OpenStudy (saifoo.khan):

what are your options?

OpenStudy (anonymous):

27 cm 33 cm 34.32 cm 24.32 cm

OpenStudy (saifoo.khan):

Hey wait. we found AP.

OpenStudy (saifoo.khan):

Now we have to find PB

OpenStudy (saifoo.khan):

And then add both

OpenStudy (anonymous):

arent they congruent so 34?

OpenStudy (saifoo.khan):

Lol. noo.

OpenStudy (anonymous):

nvm that was dumb

OpenStudy (saifoo.khan):

So for PB use tan again.

OpenStudy (anonymous):

uhhuh ... explain

OpenStudy (saifoo.khan):

the ratio of tan is, tan theta = OPPOSITE/ADJACENT. agree?

OpenStudy (anonymous):

7?

OpenStudy (saifoo.khan):

Adjacent is 7.. correct.

OpenStudy (anonymous):

so 17?

OpenStudy (anonymous):

i mean 41

OpenStudy (saifoo.khan):

we will take 45 as the angel to find the OPPOSITE side. insert the values in ratio now.

OpenStudy (anonymous):

ok how do i do that . i just got lost

OpenStudy (saifoo.khan):

tan theta = OPPOSITE/ADJACENT. you know theta = 45. opposite side you have to find. adjacent is 7.

OpenStudy (anonymous):

6.4...

OpenStudy (anonymous):

oh i see what you mean sorry

OpenStudy (saifoo.khan):

Nope

OpenStudy (saifoo.khan):

No need to be sorry. ^_^

OpenStudy (anonymous):

so 45 = opposite/ 7 ?

OpenStudy (anonymous):

I really dont get this

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