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No, only your brain can. Similar triangles can be used to solve some problems but not others but it is for you to work out - using your brain - whether or not similar triangles are relevant and then to figure out how they might be used.
Yes, triangles FGH and JKL are similar. The similarity can be established using the Angle-Angle (AA) postulate, which states that if two angles of one triangle are equal to two angles of another triangle, then the triangles are similar. If the angles of FGH correspond to the angles of JKL, the triangles are indeed similar.
A = 1/2(base)(height)
By using a ruler or doing a perdiction.And a chance of measering it on the corners of the wall.So you know what height you have everyday and in 24 hrs.
Yes, any polygon can be composed using only triangles.