two congruent triangles
They must be otherwise they would not be diagonals.
two congruent triangles
1. 4 sides 2. Opposite sides are equal in length 3. Opposite sides are parallel 4. The opposite (diagnol) angles are equal (The types of a REGULAR parallelogram are: square, rectangle, diamond, rhombus, etc.)
horizantal, vertical,diagnol. horizantal, vertical,diagnol.
Two congruent triangles.. To prove it, use the SSS Postulate.
A square
13m
Assuming that you mean diagonal (not diagnol) lines, they are straight lines that join non-adjacent vertices in a polygon or polyhedron.
16cm squared.
abc and cda
20 sqrt(2) 28.2843 (rounded)
By using Pythagoras' theorem.