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[" 1.In a "/ABC,D,E" and "F" are,respect...

[" 1.In a "/_ABC,D,E" and "F" are,respectively,the mid-points of "BC,CA" and "AB" .In "],[" lengths of side "AB,BC" and "CA" are "7cm,8cm" and "9cm" ,respectively,find "],[" perimeter of "Delta DEF" ."],[" In a triangle "/_ABC,/_A=50^(@),/_B=60^(@)" and "/_C=70^(@)." Find the measures "],[" angles of the triangle formed by joining the mid-points of the sides of this trial "],[" angles of the triangle formed by joining the mid-points of the sides of this trial "],[" angles of the triangle formed by joining the mid-points of the sides of this trial "]

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