Math Problem Statement

Reiknaðu rúmmál keilunnar.

Gefið er: x = 19 cm y = 24 cm

Námundaðu svarið að heilli tölu, einingin er cm**3

Reiknaðu rúmmál keilunnar. Gefið er: x = 19 cm, y = 24 cm. Námundaðu svarið að heilli tölu, einingin er cm**3.

Solution

To calculate the volume of the cone, we use the formula for the volume of a cone:

V=13πr2hV = \frac{1}{3} \pi r^2 h

Where:

  • rr is the radius of the base,
  • hh is the height of the cone.

From the image, the radius rr and height hh are not given directly. However, we have two values:

  • x=19cmx = 19 \, \text{cm}, which represents the radius rr of the base,
  • y=24cmy = 24 \, \text{cm}, which represents the slant height of the cone.

To calculate the height hh, we use the Pythagorean theorem because the slant height forms a right triangle with the radius and the height:

y2=x2+h2y^2 = x^2 + h^2

Solving for hh:

h=y2x2=242192=576361=21514.66cmh = \sqrt{y^2 - x^2} = \sqrt{24^2 - 19^2} = \sqrt{576 - 361} = \sqrt{215} \approx 14.66 \, \text{cm}

Now, substitute the values of r=19cmr = 19 \, \text{cm} and h14.66cmh \approx 14.66 \, \text{cm} into the volume formula:

V=13π(19)2(14.66)=13π(361)(14.66)13π(5294.26)5545.66cm3V = \frac{1}{3} \pi (19)^2 (14.66) = \frac{1}{3} \pi (361) (14.66) \approx \frac{1}{3} \pi (5294.26) \approx 5545.66 \, \text{cm}^3

Rounding to the nearest whole number:

V5546cm3V \approx 5546 \, \text{cm}^3

Thus, the volume of the cone is approximately 5546 cm³.

Do you want further details or have any questions?

Here are 5 related questions you might consider:

  1. How would the volume change if the radius were doubled?
  2. How do you calculate the surface area of this cone?
  3. What is the relationship between slant height and height in different types of cones?
  4. Can the formula for volume be derived from the formula for the volume of a cylinder?
  5. How would the calculation change if the cone was truncated?

Tip: For problems involving cones, it’s helpful to remember the Pythagorean theorem, especially when working with slant height.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Geometry
Volume of a Cone
Pythagorean Theorem

Formulas

Volume of a cone: V = (1/3)πr²h
Pythagorean theorem: y² = x² + h²

Theorems

Pythagorean Theorem

Suitable Grade Level

Grades 9-12