Explanation

The area  𝐴 of an equilateral triangle with side length 𝑎 is calculated using the formula  𝐴 = 3/4 𝑎^2.

This formula derives from the general area formula for triangles and takes into account the properties of equilateral triangles.

Explanation

A composite number is a natural number greater than 1 that has more than two positive divisors.

Both 6 and 4 are composite numbers, as they can be divided by 1, themselves, and other numbers.

However, 2 is a prime number because it only has two divisors: 1 and itself.

Explanation

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Both 3 and 5 are prime numbers.

9 is not a prime number because it can be divided by 1, 3, and 9.

Explanation

An integer is a whole number that can be positive, negative, or zero, but does not include fractions or decimals.

Thus, 5 is an integer.

Explanation

A perpendicular line forms a 90° angle with a given line, plane, or surface.

This indicates that the two lines are at right angles to each other.

Explanation

Natural numbers are positive integers starting from 1 and include numbers like 2, 4, and 9.

Therefore, all the given options (9, 4, 2) are indeed natural numbers.

Explanation

MS Access, the "Format Painter" tool is used to copy the formatting of one control and apply it to another.

This helps maintain consistency in the design of forms and reports.

Explanation

Ctrl + R in MS Word is used to right-align the selected text.
This shortcut is a quick way to change the alignment of text to the right side of the page or cell.

Additionally, here are a few more shortcuts that are useful:

• - Ctrl + Shift + >: Increase font size
• - Ctrl + Shift + <: Decrease font size
• - Ctrl + Shift + !: Format as title case
• - Ctrl + Shift + ?: Format as all caps
• - Ctrl + Shift + ~: Format as small caps
• - F5: Refresh the document
• - F7: Spell check and grammar check
• - F12: Save as

Explanation

Phishing is a type of cybercrime where an attacker sends a fake email or message that appears to be from a trustworthy source, aiming to trick the victim into revealing sensitive information such as:

• Bank account numbers
• Credit card details
• Online payment information
• Passwords

The goal of phishing is to deceive individuals into divulging confidential information, which can then be used for malicious purposes, such as identity theft or financial fraud.

Explanation

Electrons are lost in an oxidation reaction.

Oxidation simply means a gain of oxygen and an oxidizing agent is a substance that oxidizes something.

The reduction is the gain of electrons