Let the sides be abc and their opposite angles be ABC:-
Using the cosine rule angle A: (7^2 +6^2 - 8^2)/(2*7*6) = 75.5 degrees
Using the sine rule angle B: (7*sin75.5)/8 = 57.9 degrees
Angle C: 180 -75.5 -57.9 = 46.6 degrees
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Congruent figures are identical in dimensions and angles whereas similar figures have dimensions in proportion to congruent figures but both have exactly the same angles.
Congruent figures are identical in dimensions and angles whereas similar figures have dimensions in proportion to congruent figures but both have exactly the same angles.
In two dimensions, lines can be parallel, angles cannot. So no plane shape has parallel angles.
With a protractor or use trigonometry if you know its dimensions
The figures given in the question cannot be a triangle, leave alone a right angled triangle.