Question

I need this help me pls

Answer 1

Answer:

$\boxed{\sf Area \ of \ regular \ octagon \ (A) = 482 \ cm^2}$

Given:

Side length (s) = 10 cm

To Find:

Area of regular octagon (A)

Step-by-step explanation:

Area of regular octagon is given by the following formula:

$\boxed{ \bold{A = 2(1 + \sqrt{2})s^2}}$

By substituting value of s in the formula we get:

$\sf \implies A = 2(1 + \sqrt{2} ) \times {(10)}^{2} \\ \\ \sf \implies A = 2(1 + \sqrt{2} ) \times 100 \\ \\ \sf \implies A = 2(1 + 1.41) \times 100 \\ \\ \sf \implies A = 2(2.41) \times 100 \\ \\ \sf \implies A = 4.82 \times 100 \\ \\ \sf \implies A = 482 \: {cm}^{2}$

$\therefore$

Area of regular octagon (A) = 482 cm²

Answer 2

Answer:

30 cm^2 approximately

Step-by-step explanation:

The formula for calculating the area of a octagon is 2 (1 + √2) x^2 (x : side length)

2 + 2√2 × 100 = 30 cm^2 approximately