Question

1. calculati aria unui trapez isoscel cu diagonalele perpendiculare si are lininia mijlocie de 18 cm.
2. Calculati aria unui trapez isoscel cu diagonalele perpendiculare care are inaltimea de 36 cm.​

Answer 1

1. calculati aria unui trapez isoscel cu diagonalele perpendiculare si are lininia mijlocie de 18 cm.

l.m.=(B+b)/2

h1=B/2 h2=b/2 h trapez =(B+b)/2

aria trapez= (B+b)h/2=2×l.m.×2×l.m /2=2×l.m.²=2×18²=648cm²

2. Calculati aria unui trapez isoscel cu diagonalele perpendiculare care are inaltimea de 36 cm.

h trapez =(B+b)/2=36cm=l.m.

aria=2×l.m.²=2×36²=2592cm²