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help is needed

Guest Mar 21, 2018

Best Answer 

 #1
avatar+26640 
+3

Find AI using Pythagoras:

 

AI2 = (AC/2)2 + (18+5)2

 

where AC2 = 52 + 72

 

To find angle AIE first find length EI.

 

EI2 = (EH/2)2 + 52   and EH = AC

 

Having found AI and EI, now use the cosine rule to find AIE:

 

cos(AIE) = (AI2 + EI2 - 182)/(2*AI*EI) so AIE = cos-1((AI2 + EI- 182)/(2*AI*EI))

 

I’ll leave you to crunch the numbers!

Alan  Mar 21, 2018
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2+0 Answers

 #1
avatar+26640 
+3
Best Answer

Find AI using Pythagoras:

 

AI2 = (AC/2)2 + (18+5)2

 

where AC2 = 52 + 72

 

To find angle AIE first find length EI.

 

EI2 = (EH/2)2 + 52   and EH = AC

 

Having found AI and EI, now use the cosine rule to find AIE:

 

cos(AIE) = (AI2 + EI2 - 182)/(2*AI*EI) so AIE = cos-1((AI2 + EI- 182)/(2*AI*EI))

 

I’ll leave you to crunch the numbers!

Alan  Mar 21, 2018
 #2
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0

it comes up as math error

Guest Mar 21, 2018

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