if the altitude of the sun is 45 then the length of shadow of a h metre high tower standing on a plan will be

Answer 1

If you mean that the angle of elevation of the sun is 45°, then ....

then Length/h = tan45°
length = h(1) = h

Answer 2

If you mean that the angle of elevation of the sun is 45°, then ....

then Length/h = tan45°
length = h(1) = h

by 2

Answer 3

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