Question

if ( mangle a = mangle b ) and ( mangle a + mangle c = mangle d ), then ( mangle b + mangle c = mangle d ). which property is shown? reflexive property substitution property symmetric property transitive property

Explanation:

The substitution property states that if two values are equal, one can be substituted for the other in an equation. Here, since \(m\angle A = m\angle B\), \(m\angle A\) is substituted with \(m\angle B\) in the equation \(m\angle A + m\angle C = m\angle D\).

Answer:

substitution property