We read your photo as:

Calculate the angle in radians and degrees, and the area of the sector, given an arc length of 10 cm and a radius of 4 cm.

Mathematics

ScanSolve AI Answer

Answer

2.5 radians\text{2.5 radians}

450π degrees\frac{450}{\pi} \text{ degrees}

20 cm2\text{20 cm}^2

Step-by-step solution

3 steps
  1. Find the angle in radians.

    The formula for arc length ss is s=rθs = r\theta, where rr is the radius and θ\theta is the angle in radians.
    Given s=10 cms = 10 \text{ cm} and r=4 cmr = 4 \text{ cm}.

    10=4θ10 = 4\theta θ=104\theta = \frac{10}{4} θ=52 radians\theta = \frac{5}{2} \text{ radians} θ=2.5 radians\theta = 2.5 \text{ radians}
  2. Convert the angle to degrees.

    To convert radians to degrees, multiply by 180∘π\frac{180^\circ}{\pi}.

    θdegrees=52×180∘π\theta_{\text{degrees}} = \frac{5}{2} \times \frac{180^\circ}{\pi} θdegrees=450∘π\theta_{\text{degrees}} = \frac{450^\circ}{\pi}

    Using π≈3.14159\pi \approx 3.14159:

    θdegrees≈450∘3.14159\theta_{\text{degrees}} \approx \frac{450^\circ}{3.14159} θdegrees≈143.239∘\theta_{\text{degrees}} \approx 143.239^\circ
  3. Find the area of the corresponding sector.

    The formula for the area of a sector AA is A=12r2θA = \frac{1}{2}r^2\theta, where θ\theta is in radians.
    Given r=4 cmr = 4 \text{ cm} and θ=52 radians\theta = \frac{5}{2} \text{ radians}.

    A=12(4 cm)2(52)A = \frac{1}{2}(4 \text{ cm})^2 \left(\frac{5}{2}\right) A=12(16 cm2)(52)A = \frac{1}{2}(16 \text{ cm}^2) \left(\frac{5}{2}\right) A=8 cm2×52A = 8 \text{ cm}^2 \times \frac{5}{2} A=4 cm2×5A = 4 \text{ cm}^2 \times 5 A=20 cm2A = 20 \text{ cm}^2

    The angle subtended by the arc is 2.5 radians\boxed{\text{2.5 radians}} or 450π degrees\boxed{\frac{450}{\pi} \text{ degrees}}.
    The area of the corresponding sector is 20 cm2\boxed{\text{20 cm}^2}.

Was this helpful?

Try one yourself

A new problem that tests the same skill.

Still stuck on this one?

Ask a follow-up, and the answer starts from this question.

Got a different question?Ask your own question
Handwritten step-by-step solution preview

Handwritten Step-by-Step Solution

Get this as a handwritten image on WhatsApp — like a tutor wrote it for you.

Try on WhatsApp