Answer:
median
Step by step:
the line segment from a vertex to the midpoint of the opposite side. It is also an angle bisector when the vertex is an angle in an equilateral triangle or the non-congruent angle of an isoceles triangle.
10
Step-by-step explanation:
Be 10 times larger.
Imagine the perimeter is just 10. If it got 10 times larger, it goes to 100.
12
15 - 3 = 12
