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# ridicuolus question... help

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help is needed Mar 21, 2018

### Best Answer

#1
+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!

Mar 21, 2018

### 2+0 Answers

#1
+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