# Solved Problem 07 | Cube

**Problem 07**

Find the area of the triangle whose vertex is at the midpoint of an upper edge of a cube of edge a and whose base coincides with the diagonally opposite edge of the cube.

# Solved Problem 06 | Cube

**Problem 06**

The plane section ABCD shown in the figure is cut from a cube of edge a. Find the area of the section if D and C are each at the midpoint of an edge.

# Solved Problem 05 | Cube

**Problem 05**

A vegetable bin built in the form of a cube with an edge of 6 ft. is divided by a vertical partition which passes through two diagonally opposite edges. Find the lateral surface of either compartment.

# Solved Problem 04 | Cube

**Problem 04**

Find the volume and total area of the largest cube of wood that can be cut from a log of circular cross section whose radius is 12.7 inches. See figure.

# Solved Problem 03 | Cube

**Problem 03**

What is the weight of a block of ice 24 in. by 24 in. by 24 in., if ice weighs 92 per cent as much as water, and water weighs 62.5 lb per cu. ft.?

**Solution 03**

Unit weight of water

$\gamma_{water} = 62.5 \, \text{ lb/ft}^3$

Unit weight of ice

$\gamma_{ice} = 92\% \, \gamma_{water}$

$\gamma_{ice} = 0.92(62.5)$

$\gamma_{ice} = 57.5 \, \text{ lb/ft}^3$

Volume of ice block

$V_{ice} = (24/12)^3$

$V_{ice} = 8 \, \text{ ft}^3$

Weight of 8 ft^{3} ice block

# Solved Problem 02 | Cube

**Problem 02**

How much material was used in the manufacture of 24,000 celluloid dice, if each die has an edge of 1/4 inch?

# Solved Problem 01 | Cube

# Smallest number for given remainders

# Arithmetic, geometric, and harmonic progressions

**Elements**

a_{1} = value of the first term

a_{m} = value of any term after the first term but before the last term

a_{n} = value of the last term

n = total number of terms

m = m^{th} term after the first but before n^{th}

d = common difference of arithmetic progression

r = common ratio of geometric progression

S = sum

## Arithmetic Progression, AP

Arithmetic progression is a sequence of numbers in which the difference of any two adjacent terms is constant. The constant difference is commonly known as common difference and is denoted by d. Examples of arithmetic progression are as follows: