圆锥公式的体积
测量是数学的一个分支,涉及各种几何形状的研究。它还考虑了这种几何形式的面积和体积。它是与测量有关的数学分支,例如代数方程在面积、体积和其他几何形式质量的测量中的表达和应用,而几何是与空间关系有关的数学分支。
锥体
圆锥体是一个实心的三维几何对象,其底部为圆形,顶部有一条锋利的边缘,称为顶点。它有一个面和一个顶点。对于锥体,没有边。它是一种顶部呈弧形,底部呈圆形的形式。一个圆锥有一个面,一个顶点,没有边。它的斜高是从锥顶到锥底圆上任意一点的线段长度。直圆锥是其峰值直接位于圆形底部上方垂直距离处的圆锥。斜圆锥是其顶点不直接位于圆形底部上方的圆锥。
圆锥的体积
锥体的体积定义为它所填充的空间量或容量。圆锥的体积以立方单位测量,例如 cm 3 、m 3 、in 3等。通过围绕其任何顶点旋转三角形,可以产生一个圆锥。圆锥是具有圆形底面的立体三维形式。它有一个曲面。垂直高度是从底到顶点的距离。圆锥可以分为两种类型:直圆锥和斜圆锥。直圆锥的顶点在底心的垂直上方,而斜圆锥的顶点不在底心的垂直上方。
圆锥体积的公式由下式给出,
V =
where,
r = radius of the cone,
h = height of the cone,
π = 22/7
Also, the relationship between the cone’s volume and slant height by applying Pythagoras’ theorem to it is given by,
h2 + r2 = L2
=> h = √(L2 – r2)
Hence, the volume of cone in terms of its slant height is given by,
V =
推导
Suppose we have a cone with a circular base whose radius is r and height is h.
We know that the volume of a cone is equal to one-third of the volume of a cylinder having the same base radius and height.
So, the volume becomes,
V = 1/3 x Circular Base area x Height
= 1/3 x πr2 x h
= πr2h/3
This derives the formula for volume of cone.
示例问题
问题 1. 求半径为 7 厘米、高为 14 厘米的圆锥的体积。
解决方案:
We have, r = 7 and h = 14.
Volume of cone = 1/3 πr2h
= (1/3) (22/7) (7) (7) (14)
= (1/3) (7) (7) (2)
= 32.66 cm3
问题 2. 求半径为 5 厘米、高为 9 厘米的圆锥的体积。
解决方案:
We have, r = 5 and h = 9.
Volume of cone = 1/3 πr2h
= (1/3) (3.14) (5) (5) (9)
= (3.14) (5) (5) (3)
= 235.49 cm3
问题 3. 求半径为 7 厘米,高为 12 厘米的圆锥的体积。
解决方案:
We have, r = 7 and h = 12.
Volume of cone = 1/3 πr2h
= (1/3) (22/7) (7) (7) (12)
= (22) (7) (4)
= 616 cm3
问题 4. 求一个半径为 8 厘米,高为 15 厘米的圆锥的体积。
解决方案:
We have, r = 8 and h = 15.
Volume of cone = 1/3 πr2h
= (1/3) (22/7) (8) (8) (15)
= (1/3) (22/7) (8) (8) (5)
= 335.02 cm3
问题 5. 求一个直径为 24 厘米、斜高为 13 厘米的圆锥的体积。
解决方案:
We have, 2r = 24
=> r = 24/2
=> r = 12
Also, l = 13.
Volume of cone = 1/3 πr2 √(l2 – r2)
= (1/3) (22/7) (12) (12) (√(132 – 122)
= (1/3) (22/7) (12) (12) (5)
= 754.28 cm3
问题 6. 求直径为 16 厘米、斜高为 10 厘米的圆锥的体积。
解决方案:
We have, 2r = 16
=> r = 16/2
=> r = 8
Also, l = 10.
Volume of cone = 1/3 πr2 √(l2 – r2)
= (1/3) (22/7) (8) (8) (√(102 – 82)
= (1/3) (22/7) (8) (8) (6)
= 402.048 cm3
问题 7. 求一个高 8 厘米、斜高 17 厘米的圆锥的体积。
解决方案:
We have h = 8 and l = 10.
Find the value of r.
r = √(l2 – h2)
= √(172 – 82)
= √(289 – 64)
= 15
Volume of cone = 1/3 πr2h
= (1/3) (22/7) (15) (15) (8)
= (1/3) (22/7) (5) (15) (8)
= 1884.6 cm3