Given: A cuboid with the dimesion below:

To Determine: The surface area of the cuboid
The formula for finding the surface area of a cuboid is given as:

From the diagram, it can be seen that

Substitute the given into the formula as shown below:

Hence, the surface area of the given cuboid is 130cm²
The answer is the second answer choice, an = -13 + 5(n - 1)
Example 2: x=10
Example 3: x=-1
Example 4: x=35
Example 5: a-b+c=9
Example 6: x=1, x=1/2
Further explanation:
<u>Example 2:</u>

Taking Square on both sides

<u>Example 3:</u>

Subtracting 9 from both sides

Taking Square on both sides

<u>Example 4:</u>

subtracting 8 from both sides

Taking Square on both sides

Subtracting 1 from both sides

<u>Example 5:</u>

Taking Square on both sides

<u>Example 6:</u>

Taking square on both sides

dividng whole equation by 8

Keywords: Radical Expressions, Examples
Learn more about radical expressions at:
#LearnwithBrainly
Answer:
DEF is a right angle
Step-by-step explanation:
Answer:
first it is not a maths question
second the ans to the question
Step-by-step explanation:
<h2>
<em><u>p</u></em><em><u>l</u></em><em><u>e</u></em><em><u>a</u></em><em><u>s</u></em><em><u>e</u></em><em><u> </u></em><em><u>m</u></em><em><u>a</u></em><em><u>r</u></em><em><u>k</u></em><em><u> </u></em><em><u>b</u></em><em><u>r</u></em><em><u>a</u></em><em><u>i</u></em><em><u>n</u></em><em><u>l</u></em><em><u>i</u></em><em><u>e</u></em><em><u>s</u></em><em><u>t</u></em></h2>
<em><u>p</u></em><em><u>l</u></em><em><u>e</u></em><em><u>z</u></em><em><u>z</u></em><em><u>z</u></em><em><u>z</u></em><em><u>z</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>