![]() |
||||||||||||
1 | ![]() x=√22+22+22)=2√3cm |
2 | ![]() x=√42+62+42=√68 =2√17cm |
|||||||||
3 | ![]() 底面の対角線(長方形の横)は √22+22=√8=2√2 S=2×2√2=4√2cm2 |
4 | ![]() 対角線AC=√22+22+22 =√12=2√3 対角線BD=√22+22 =√8=2√2 S=2√3×2√2÷2=2√6cm2 . |
|||||||||
5 | ![]() △ABCの1辺は, √22+22=√8=2√2 1辺aの正三角形の面積は
|
6 | ![]() AD=√22+22=2√2 BC=√42+42=4√2 AB=√22+42=2√5 右図で,h2+(√2)2=(2√5)2 h2=20−2=18で,h=√18=3√2 S= ![]() =3√2×3√2=18cm2 |
[トップに戻る] [問題に戻る] |