[" 4.BE and CF are two equal altitudes of atriangle ABC.Using RHS congruence "],[" rule,prove that the triangle ABC is isosceles."]

BE and CF are two equal altitudes of a triangle ABC. Using RHS congruence rule, prove that the triangle ABC is isoscles.

BE and CF are two altitudes of a triangle ABC. Using RHS congruence rule, prove that the triangle ABC is isosceles.

In any triangle ABC : If (cosA)/a= (cosB)/b , prove that the triangle is isosceles.

AD, BE and CF , the altitudes of triangle ABC are equal. Prove that ABC is an equilateral triangle.

AD, BE and CF are altitudes of triangle ABC. If AD = BE = CF, prove that triangle ABC is an equilateral triangle.

AD and BE are respectively altitudes of an isosceles triangle ABC with AC=BC . Prove that AE=BD

Two pairs of statements p and q are given below . Combine theses two statements using the biconditional phrase "if and only if " . p :If ABC is an isosceles triangle , then the base angles are equal . q : If two base angles of the traingle ABC are equal , then the traingle ABC is isosceles .

ABC is a triangle in which BE and CF are perpendiculars to AC and AB respectively. If BE=CF, prove that triangleABC is isosceles.