Which of the following additional statements would you need to prove these two triangles are similar by SAS similarity? 1. ∠A ≅ ∠D
2. ∠B ≅ ∠E
3. ∠B ≅ ∠F
4. ∠C ≅ ∠F

option 1

as the sides were already given, A and D are the only way that the triangle can have SAS.

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116