Question

Triangle RSV is congruent to triangle TVS. Find x.

Answer 1

x - 5 = 78
x = 78 + 5
x = 83  <==

Answer 2

Answer: 83.

Step-by-step explanation:

We know that if two triangles are congruent then their corresponding parts are also congruent by CPCTC .

If Triangle RSV is congruent to triangle TVS, then their corresponding angles are also congruent .

$\angle{V}=\angle{S}$  [The third letter of each triangle name]

$(x-5)^{\circ}=78^{\circ}\\\\\Rightarrow\ x-5=78$

Add 5 on both the sides of the equation , we get

$x=78+5=83$

Hence, the value of x = 83