Fie trapezul isoscel ABCD cu baza mare AD. Aflati AC+BD, daca BD=10 cm.

Răspuns :

ABCD trapez isoscel => are diagonalele egale
Deci, AC=BD=10 cm

AC+BD=10cm + 10cm = 20cm
daca e trap. isoscel ACcongruent BD ca diagonale
deci AC=BD=10+10=20cm as simple as that!!
Vezi imaginea ALBATRAN