1.

If AD, BE and CF are the altitudes of AABC and semi-perimeter of AABC is 22 cm, then AD + BE + CF can be​

Answer»

Answer:

In right-angle triangles BCE and CBF, we have,

BC = BC (COMMON hypotenuse);

BE = CF (given).

Hence BCF and CBF are congruent, by RHS theorem. Comparing the triangles, we GET ∠B=∠C.

This implies that

AC = AB (sides opposite to EQUAL angles).

Similarly,

AD=BE⇒∠B=∠A

⇒AC=BC

Together, we get AB=BC=ACor △ABC is equilateral. [henceproved]


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