50 ! which pairs of triangles can be shown to be congruent using rigid motions?

The pairs shown in 1,3, 6 are congruent and the pairs shown in 2,4,5 are not congruent.

Explanation:

From the given figure we can easily noticed that the triangles ABC, DEF and QRS can be easy formed by rigid motions because the corresponding sides are same. But the triangle JKL can not be formed by rigid motions.

The triangle DEF can be formed if triangle ABC reflects across x-axis and after that it reflects across the y-axis.

So, triangle ABC and DEF are congruent.

The  triangle QRS can be formed if triangle ABC reflects across y-axis and after that it translated by (0,-1).

So, triangle ABC and QRS are congruent.

Since the ABC and DEF are congruent, and ABC and QRS are congruent, So by using transitive property of congruent DEF and QRS are congruent.

Therefore only the pairs shown in 1,3, 6 are congruent and the pairs shown in 2,4,5 are not congruent.

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.