...the middle point of one side of a triangle parallel to the base is equal to half of the base. 3. (a) Any two sides of a triangle are together greater than the third side. I. 20. 4. (a) If two triangles have two angles of the one respectivtely equal to two angles of the...

...equal to a given straight line. How many straight lines will the construction give ? 2. Prove that any two sides of a triangle are together greater than the third side. Prove by a geometrical construction that the difference between any two Bides of a triangle is less...