If you are proving a congruence of triangles then you need to match the corresponding parts to the triangle you are proving congruent.
BAC would then be congruent to MJR because of the corresponding angles
B is the same angle as M
A is the same angle as J
C is the same angle as R
Formula = (a + b)^2 = a^2 + 2ab + b^2
x^2 + 4x + 4 + 9 = 0
x^2 + 4x + 13 = 0
I can tell you what it is but without a picture i can not help you.
A cross section of anything is when the shape is getting cut straight into an object. It is like viewing the inside of something made by cutting through the object.
Answer:
0=2pi/3 or another way of writing I is 0= 120°+360°×n
