Triangle abc is reflected across line l to form δalblcl, and aal intersects line l at point d. which equation is not necessarily true? a. ald = bld b. ad = ald c. m∠bac = m∠blalcl d. m∠acb = m∠alclbl

Option A i.e. is not necessarily true.

Explanation:

Since, According to the definition of Reflection, If a  shape reflected through any line, then ,we get a congruent shape with respect to given shape.

So, If   reflected across a line L and makes then,

Thus, corresponding measurements must be Congruent.( CPCT )

That is, , , ,

, and

Moreover,The corresponding Distance of vertices from the reflected point D is same for and ( according to the property of reflection)

That is, and

But, it is not necessary, .

Therefore option first is unnecessary.

y=x+9

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step-by-step explanation:

c. side angle side. u shares the same sides