1) S =1/2a•h; S=8/2•4,5=18(cm)
2)S=1/2•9•12=6•9=54
c=√(a²+b²) = √(81+144)=√225=15
h=2S:c; h = 108:15=7,2
3)
1) S =1/2a•h; S=8/2•4,5=18(cm)
2)S=1/2•9•12=6•9=54
c=√(a²+b²) = √(81+144)=√225=15
h=2S:c; h = 108:15=7,2
3)