We cannot know.
No siree
The questioner neglected to include the drawing that accompanied the question in his textbook,so we don't know where point 'D' is ? ? ?
The scale factor of triangle ABC to triangle XYZ can be determined by comparing the lengths of corresponding sides of the two triangles. To find the scale factor, divide the length of a side in triangle ABC by the length of the corresponding side in triangle XYZ. If all corresponding sides have the same ratio, that ratio is the scale factor for the triangles.
15
7.2
5
25
In order to find length BC the length of AC or length of the hypotenuse must be given
no
A triangle has 3 sides and so the length of bc will depend on its perimeter.
No siree
It can be but need not be.
The questioner neglected to include the drawing that accompanied the question in his textbook,so we don't know where point 'D' is ? ? ?
yes
The scale factor of triangle ABC to triangle XYZ can be determined by comparing the lengths of corresponding sides of the two triangles. To find the scale factor, divide the length of a side in triangle ABC by the length of the corresponding side in triangle XYZ. If all corresponding sides have the same ratio, that ratio is the scale factor for the triangles.
Triangle ABC would be an isosceles. An isosceles triangle is defined as having two sides of equal length. This would also mean, then, that two angles in the triangle are also the same.
If you are really talking about a closed triangle ABC, then the length of side "a" (given as 19) does not matter in the calculation. Sum of the angles of a triangle is 180 degrees. Angle B and C add up to 15 + 65 = 80 degrees. Hence angle A is (180 - 80) = 100 degrees