A triangular prism with a Triangle as its base will have three congruent, rectangular faces.

Equilateral

Step-by-step explanation:

A triangular prism with an Equilateral Triangle as its base will have three congruent, rectangular faces. This is because an Equilateral triangle is one that has all its sides equal.

All the sides being equal thereby translates to it having 3 similar rectangular sides thereby justifying the prism having 3 congruent rectangular faces.

30005

yes ok                                            

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