ABDE is an isosceles trapezoid.Select all pairs of congruent triangles.1. Triangle ABE and triangle DBE2. Triangle ABD and triangle DAE3. Triangle ABE and triangle BAD4. Triangle AED and triangle BDE5. Triangle EAB and triangle EDB

3. Triangle ABE and triangle BAD
4. Triangle AED and triangle BDE
Explanation
in any isosceles trapezoid, two opposite sides (the bases) are parallel, and the two other sides (the legs) are of equal length . The diagonals are also of equal length.also When all three sides are equal to each other on both triangles, the triangle is congruent
so
Step 1
1. Triangle ABE and triangle DBE
so, option 1 is Not true
Step 2
2. Triangle ABD and triangle DAE
so, option 2 is Not true
Step 3
3. Triangle ABE and triangle BAD
we can see both triangles have the same base and the same longest side ( diagonal of the trapezoid), so
Options 3 is TRUE
4. Triangle AED and triangle BDE
we can see both triangles have the same base and the same longest side ( diagonal of the trapezoid), so
Options 4 is TRUE
Step 4
finally
so, option 5 is Not true
therefore, the answer is
3. Triangle ABE and triangle BAD
4. Triangle AED and triangle BDE
I hope this helps you