B. ∠DEF ≅ ∠ABC when JK is constructed equal to HI.
What is angle of elevation?
It is the angle between horizontal plane and oblique line from the observer's eye to some object above his eye.
to make angle DEF = angle ABC
the inclination from the base should be of same be degrees . hence , ben measured HI and made JK equal to that so that ED can be drawn having the same inclination what AB have to make equal angle of elevation.
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