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1. Two similar triangles will always have  angles.
2. If in triangles \(PQR\) and \(XYZ\), \(\frac{PQ}{XY} = \frac{QR}{YZ}\) then they will be similar if .
3. A flag pole \(15 \ m\) high casts a shadow of \(3 \ m\) at \(10 \ a.m\). The shadow cast by a building at the same time is \(18.6 \ m\). The height of the building is .