# Heptagonal pyramid

A hardwood for a column is in the form of a frustum of a regular heptagonal pyramid. The lower base edge is 18 cm, and the upper base of 14 cm. The altitude is 30 cm. Determine the weight in kg if the wood density is 10 grams/cm

^{3}.### Correct answer:

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**Math student**

Problem #1] The aluminum frustum of a right circular cone has an altitude of 15 inches and, whose upper and lower bases have a radii 10 inches and 5 inches respectively; find the following;

a) The lateral surface area in ft2 .

b) The total surface area in ft2 .

c) The volume of the frustum of the cone in ft3 .

a) The lateral surface area in ft2 .

b) The total surface area in ft2 .

c) The volume of the frustum of the cone in ft3 .

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Most natural application of trigonometry and trigonometric functions is a calculation of the triangles. Common and less common calculations of different types of triangles offers our triangle calculator. Word trigonometry comes from Greek and literally means triangle calculation.

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#### You need to know the following knowledge to solve this word math problem:

**statistics**- geometric average
**solid geometry**- pyramid
- frustum
**planimetrics**- polygon
- area of a shape
**goniometry and trigonometry**- cotangent

#### Units of physical quantities:

#### Grade of the word problem:

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