In triangle ABC, E and D are two points lying on AB and
AC respectively such that CE and BD intersect each
other at O. If triangle AEC congreunt CDB, then triangle ABC will always
be a/an
(1) Obtuse-angled triangle
(2) Scalene triangle
(3) Isosceles right-angled triangle
(4) Equilateral triangle


Here triangle AEC and CDB are congruent so AE= CD , EC= BDand AC = BCAlso angle EAC = angle DCBnow take AC = BCmeans angle CAB = angle CBA so it has all angles equal so it is a equilateral triangle

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2)scalene triangle
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