Desenul vine un patrat cu un romb in el
ΔAMQ-Δdrept (A=90 grade)
MQ²=AQ²+AM²=5²+5²=25+25=50
MQ=√50=5√2
MQ=MN=NP=PQ=5√2
a) A( MNPQ)=l²=MN²=5√2²=50 m²
1m²..........4 kg ciment
50m²........X kg ciment
X=50*4=200 kg ciment
b) A(ABCD)=l²=10²=100 m²
A(ABCD)-A(MNPQ)=100-50=50m²
1m².......250 grame gazon
50 m²......Xgrane gazon
X=50*250=12500 grame=12,5 kg