Line hf is tangent to circle d at point e. segment de is the radius of circle d, what is true about def?
a. angle def is congruent to angle deh
b. angle def is an acute angle
c. angle def is an obtuse angle
d. angle def is a straight angle

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality