圆柱和圆锥整理与练习1.ppt
,圆柱和圆锥整理与练习1,圆柱和圆锥,圆柱,圆柱的认识,圆柱的表面积,圆柱的体积,圆锥,圆锥的认识,圆锥的体积,1、圆柱的两个圆面叫做 ;周围的面叫做 ;两个底面之间的距离叫做 。一个圆柱的高有 条。 2、圆柱的底面都是 ,并且大小 ;圆柱的侧面是 面。,底面,侧面,高,无数,圆面,相等,曲,圆柱的侧面展开后是 ,这个 等于圆柱底面的周长, 等于圆柱的高。,长方形,长方形的长,长方形的宽,圆柱侧面积= × 。,S侧=2rh,圆柱的表面积= + 。,r,h,侧面积,底面积×2,底面周长,高,S侧=ch,下面哪个图是圆柱的展开图,并说明理由。,6.28,3,3,如何计算圆柱的体积?,圆柱的体积=底面积×高,V=sh,V=r2h,r,h,2、圆柱和圆锥有什么共同点和不同点?,1、圆锥的底面是个 ,侧面是一个 面,从圆锥的顶点到底面圆心的距离是圆锥的 。,圆面,曲,高,V= sh,V= r2h,r,h,圆锥的体积是与它等底等高 的圆柱体积的,4,S侧=ch =3.14×4×5 =62.8,S表= S侧 2S底 =62.812.56×2 =62.825.12 =87.92,S底=r² =3.14×2² =12.56,87.92,V=sh =12.56×5 =62.8,62.8,S侧=ch =3.14×10×8 =251.2,S表= S侧 2S底 =251.278.5×2 =251.2157 =408.2,S底=r² =3.14×5² =78.5,V=sh =78.5×8 =628,5,408.2,628,2.5,19.625,×3.14×2.5²×3,= 3.14×6.25,= 19.625,1.2,×3.14×0.6²×1.8,= 3.14×0.216,= 0.67824,0.67824,S侧=ch =3.14×0.8×1.6 =3.14×1.28 =4.0192,表面积,S侧=ch =3.14×15×2×20 =1884,S表= S侧 2S底 =1884706.5×2 =18841413 =3297,S底=r² =3.14×15² =706.5,彩带长=4条直径4条高打结处15厘米,15×420×415 =608015 =155(厘米),底面周长,侧面积1底面积,容积,S侧=ch =15.7×6 =94.2, 94.219.625 =113.825(dm²),S底=r² =3.14×(15.7÷3.14÷2)² =19.625,V=sh =19.625×6 =117.75,V柱=sh =3.14×(10÷2)²×10 =3.14×250 =785,V长方体=abh =11×11×9 =121×9 =1089,