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Word problemsArithmeticMiddle schoolabout 0:41

Find the area of a circle with radius 3: animated lesson

A narrated, step-by-step word problems video lesson with captions. Final answer: Area = 9π ≈ 28.27433388 square units.

SpeedLanguage

Video with a synthetic English voice and captions. Pick another language for subtitles in that language, or open the interactive version.

Video narrated by a synthetic voice (Piper TTS, en_US-ljspeech-high voice (LJ Speech dataset, public domain)); the steps come from our maths engine and the answer was checked independently. Download MP4 (0.2 MB) · Captions (WebVTT)

Steps on screen

1. The problem
Worked example
Find the area of a circle with radius 3
2. Step by step
1. Read the problem
2. Area
3. The answer
$\text{Area = 9π ≈ 28.27433388 square units}$
Area = 9π ≈ 28.27433388 square units
4. Check
- √(A/π) = 3 ✓

Transcript

The problem. Here is the problem: Find the area of a circle with radius 3. Circle with radius 3; area A equals pir squared.

Step by step. Read the problem. Radius r equals 3. Area. A equals pir squared equals pi times 3 squared equals 9pi approximately 28.27433388.

The answer. So the answer is Area equals 9pi approximately 28.27433388 square units. Circle with radius 3; area A equals pir squared.

Check. the square root of A/pi equals 3, which checks out.

About word problems

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Find the area of a circle with radius 3: Step-by-Step Lesson