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Step-by-step explanation:

If 3 sides in one triangle are

congruent to 3 sides of a

second triangle, then the

triangles are congruent.

If two sides and the included

angle of one triangle are

congruent to the corresponding

parts of another triangle, the

triangles are congruent.

If two angles and included side

of one triangle are congruent to

the corresponding parts of

another triangle, the triangles

are congruent.

If two angles and the nonincluded side of one triangle are

congruent to the corresponding

parts of another triangle, the

triangles are congruent.If the hypotenuse and leg of one

right triangle are congruent to

the corresponding parts of

another right triangle, the right

triangles are congruent

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons