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.

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.

question

what is the value of the third quartile of the data set represented by this box plot? a. 19 b. 21 c. 26 d. 29

answer

c