Darnell is mountain climbing with Kirk and has just climbed a 9-meter vertical rock face. Kirk is standing at the bottom of the cliff, looking up at Darnell. If Kirk is 15 meters away from Darnell, how far away from the cliff is Kirk standing?

Correct result:

a =  12 m


b=9 m c=15 m  a2+b2=c2  a=c2b2=15292=12 m

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