Question

Calculati aria unui romb de diagonale d1 si d2 in urm cazuri:

a)d1=50cm

d2=16%din d1

b)d2=20 cm

d1=60% din d2

Answer 1

a)$d_{1} =50 cm$

$d_{2} = \frac{16}{100} *50= \frac{800}{100}= 8cm$

$A_{romb} = \frac{ d_{1} * d_{2} }{2} = \frac{50*8}{2} = \frac{400}{2} =200cm ^{2}$

b) $d_{1} =20 cm$

$d_{2} = \frac{60}{100} *20= \frac{1200}{100}=12cm$

$A_{romb} = \frac{ d_{1} * d_{2} }{2} = \frac{20*12}{2} = \frac{240}{2} =120cm ^{2}$