Copy angle α. 
You may use what we learned in class 
for your proof, but show all constructions.
 Explain the steps in the spreadsheet and
prove the the angle you obtained is as 
desired.
Hint: Think triangles.

Reason

Given

By construction

By constructio, we constructed a triangle with sides of length a, b, and c how we did in class.

They both have a length of a

They both have a length of b

They both have a length of c

By SSS

Corresponding parts of congruent triangles are congruent.

Construction steps

Proof

A = (4, 0)
B = (-3, 0)
C = (1, 2)
α = Angle(A, B, C)
a = Segment(A, B)
b = Segment(C, B)
d_1: abs(a)
AB = Distance(A, B)
BC = Distance(B, C)
AC = Distance(A, C)