In ∆abc, the altitudes from vertex b and c intersect at point m, so that bm = cm. prove that ∆abc is isosceles.

BCM is isosceles. Due to the fact that BM=CM

An altitude in the third vertex A of the triangle ABC, has to go through M, and it will intersect BC in the middle.

This means that the angles <CBA = <BCA, implies that ABC is isosceles.

es una operación aritmética.

step-by-step explanation:

no se que fórmula requiera, pero te puedo decir que es adición. deberías revisar porque tema vas y ver que fórmulas puedes aplicar.

1. 22

2. 1

3. 7

4. 18

step-by-step explanation

e2020 got it right