if two sides and the included angle of one triangle are equal to the corresponding sides and angle of another triangle, the triangles are congruent. ... If two angles and the included side of one triangle are equal to the corresponding angles and side of another triangle, the triangles are congruent.
Since the denominator has to be 100 and 9/10, 0.90, and 90% are all equal the you would just need to make the 9 into a 90. Therefore, yout answer will be 90/100.
