Question

What information is necessary to prove the triangles congruent by SAS? ​

Answer 1

The information necessary is kind of in the name

S- side A- angle S-side

You need to congruent sides and one congruent angle to prove that the triangles are congruent.

Hope this helps!

Answer 2

SAS requires two congruent sides and the included angle be also congruent

Given is the picture are congruent triangles

ΔACB ≅ ΔECD, because:

• AC ≅ EC, given
• BC ≅ DC, given
• ∠ACB ≅ ∠ECD, vertical angles