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What is 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 +... + 10000
1+2+3+4+5+6+7+8+9+...+10000
=(1+10000)×10000÷2
=10001×5000
=50005000
How much is 1 + 2 + 3 + 4 + 5 + 6 added to 10000
(1+10000）x500=10000x500=5000000
How many vertices of a dodecahedron? How many edges? How many icosahedrons?
It's better to have a picture and brainstorm
Dodecahedron
Face: 12 regular pentagons
Vertex: 20
Edge: 30
Icosahedron
Face: 20 regular triangles
Vertex: 12
Edge: 30
Dodecahedron diagram
http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%CA%AE%B6%FE%C3%E6%CC%E5&in=8862&cl=2&cm=1&sc=0&lm=-1&pn=0&rn=1&di=2745542124&ln=163
20 facet diagram:
http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&word=%B6%FE%CA%AE%C3%E6%CC%E5&in=5960&cl=2&cm=1&sc=0&lm=-1&pn=1&rn=1&di=47245444&ln=57
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