Two poles stand on the opposite sides of a road, 10 m wide. The heights of the two poles are 7m and 9m respectively. Estimate the distance between their tops, nearest to the whole number of metres.
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Step-by-step explanation:
construct CX parallel to AB
CX=AB=10(asABXC is a rectangle)
CA=XB=7(same as Above)
XD=BD-XB
9-7
=2m
inRight angle triangle
(CX) ^2 +(XD) ^2=(CD) ^2
(10)^2+(2)^2=cd^2
100+4=cd2
√104=cd
cd=10.198
=11meter
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