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yes those after market as factory alarms will act up if batt is low as the key activator on the key and chain batt go low yea it will go off and wont open doors all kinds of things best too keep good batts in the troller ?
ok i think this is how you do it but i'm not 100% sure. if i had to do it i would measure the height of the fire hydrant and its shadow and work out the ratio eg. if the shadow is 2 metres and the actual hydrant is 1 metre then you can work out the height of the tree from its shadow eg. the shadow is 8 metres then the tree is 4 metres. haha sorry i am not very good at explaining what i would do but it makes sense in my head. :)
