Question

Janet is designing a garden in her backyard that is a regular octagon with a side length of 6 ft and an apothem of 7.24

ft. What is the approximate area of the garden?
O 72 ft2

O 347.5 ft2

O 173.8 ft2

O 86.9 ft2

Answer 1

It should be noted:

• Area of regular octagon: 2(1 + √2)x² (x = side)

Substitute the side length into the formula.

• 2(1 + √2)x²
• => 2(1 + √2) × 6²

Simplify the distributive property.

• => 2(1 + √2)36
• => 72(1 + √2)
• => 72 + 72√2

Simplify 72√2 using a calculator.

• => 72 + 101.82

Add if needed.

• => 173.82 ft²

Looking at the options, it is said that option C is correct as 173.8 and 173.82 are approximate numbers.

Option C is correct.

Answer 2

c.
`\sf area \ of \ octagon = 173.82 \ ft^2`

Step-by-step explanation:

`\sf area \ of \ octagon = 2(1+√(2) )a^2`

Here "a" refers to side length.

using this formula:

`\hookrightarrow \sf area \ of \ octagon = 2(1+√(2) )(6)^2`

`\hookrightarrow \sf area \ of \ octagon = 173.82 \ ft^2`