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Mathematics 17 Online
OpenStudy (anonymous):

Geometry question (figure in comments) 1. calculate DE 2. calculate EG

OpenStudy (anonymous):

OpenStudy (anonymous):

@ganeshie8 any help?

ganeshie8 (ganeshie8):

similar triangles

ganeshie8 (ganeshie8):

DE is the geometric mean between the hypotenuse and the segment of the hypotenuse next to DE.

ganeshie8 (ganeshie8):

one thing at a time. lets calculate DE first :)

ganeshie8 (ganeshie8):

hypotenuse = DF = 3+8 = 11 right ?

OpenStudy (anonymous):

yes

ganeshie8 (ganeshie8):

now DE is the geometric mean between hypotenuse & segment next to DE => DE = \(\sqrt{3*11}\)

OpenStudy (anonymous):

5.7?

ganeshie8 (ganeshie8):

thats right ! you can leave it as \(\sqrt{33}\) also, unless the question explicitly asks for decimal form

OpenStudy (anonymous):

ok cool so DE would be what I said earlier?

OpenStudy (anonymous):

root 55?

ganeshie8 (ganeshie8):

you mean EG ?

OpenStudy (anonymous):

EG sorry, yes

ganeshie8 (ganeshie8):

thats not correct. looks something went wrong in ur calculation s...

OpenStudy (anonymous):

ok

ganeshie8 (ganeshie8):

if you see , EG is the altitude from vertex E to hypotenuse

OpenStudy (anonymous):

right

ganeshie8 (ganeshie8):

The length of the altitude is the geometric mean between the segments of the hypotenuse

ganeshie8 (ganeshie8):

=> EG = \(\sqrt{3*8}\)

ganeshie8 (ganeshie8):

does that make sense ?

OpenStudy (anonymous):

2 root 6

ganeshie8 (ganeshie8):

thats right !!

OpenStudy (anonymous):

thank you!

ganeshie8 (ganeshie8):

for solving these you just need to remember two things : 1) The length of the altitude in these right triangles is the geometric mean between the segments of the hypotenuse. 2) Each leg is also a geometric mean between the hypotenuse and the segment of the hypotenuse next to the given leg.

ganeshie8 (ganeshie8):

yw.. .:D

OpenStudy (anonymous):

I have one more problem if you dont mind?

ganeshie8 (ganeshie8):

sure post :)

OpenStudy (anonymous):

ganeshie8 (ganeshie8):

soh-cah-toa

OpenStudy (anonymous):

Calculate for cos, sin, and tan.

OpenStudy (anonymous):

Yes sohcahtoa

ganeshie8 (ganeshie8):

you giving segment-one exam right :)

OpenStudy (anonymous):

exam?

ganeshie8 (ganeshie8):

nvm :)

OpenStudy (anonymous):

oh okay lol

ganeshie8 (ganeshie8):

look the triangle from \(\theta\)

OpenStudy (anonymous):

okay

ganeshie8 (ganeshie8):

you goto \(\theta \) corner, sit there and look

ganeshie8 (ganeshie8):

can you identify below two : 1) adjacent side 2) opposite side ?

OpenStudy (anonymous):

adjacent is 10, opposite is 10?

OpenStudy (anonymous):

*12

ganeshie8 (ganeshie8):

hypotenuse = 12, there wont be any change in hypotenuse, no matter from which corner you see the triangle ok

OpenStudy (anonymous):

okay

ganeshie8 (ganeshie8):

adjacent side = 10, as it is the one next to \(\theta\)

ganeshie8 (ganeshie8):

opposite side is not given, we need to find it

ganeshie8 (ganeshie8):

|dw:1346452508833:dw|

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