Oblicz przekątną i pole równoległoboku o bokach 4 cm i 6 cm oraz kącie ostrym 30 st
P=absin{alfa}
P=4*6*0,5= 12
d1 = √a²-2abcos{alfa}+b² = 16-(2*4*6*0,5)+36
d1= 16-60 = √-44
d1= 2√11
P=a*b*sinα
sin30=1/2
P=6*4*1/2=12 cm²
P=a*h
h1=2 ; h2=3
x²+2²=4²
x=√12=2√3
d1²=(6-2√3)²+2²
d1²=36-24√3+12+4
______ _______
d1=√52-24√3=2√13-6√3
d2²=6²+2²=40
d2=√40=2√10
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P=absin{alfa}
P=4*6*0,5= 12
d1 = √a²-2abcos{alfa}+b² = 16-(2*4*6*0,5)+36
d1= 16-60 = √-44
d1= 2√11
P=a*b*sinα
sin30=1/2
P=6*4*1/2=12 cm²
P=a*h
h1=2 ; h2=3
x²+2²=4²
x=√12=2√3
d1²=(6-2√3)²+2²
d1²=36-24√3+12+4
______ _______
d1=√52-24√3=2√13-6√3
d2²=6²+2²=40
d2=√40=2√10