ACT · Plane Geometry · Polygons, perimeter, and area
Question act-q-00465
Medium Multiple choice No calculator
The question
A circle has radius 7. What is its area, in terms of π?
- 49π
- 98π
- 7π
- 14π
Show answer & worked solution
Answer: 49π
Worked solution. Area of a circle is πr². Here r = 7, so area = π × 7² = 49π.
Why each wrong choice is wrong. Confusing area (πr²) with circumference (2πr) is the dominant error here. The 2πr distractor catches it perfectly.
Test-day tactic. Area scales as the square of the radius; circumference scales linearly. When in doubt, sketch a unit circle and check.
About this question type
Items test areas and perimeters of quadrilaterals, properties of parallelograms and trapezoids, and the interior angle sum of a polygon ((n − 2) × 180°).
You will see a question shaped like this one on roughly every other official ACT form, typically at a moderate position in the section — solidly within the range that separates a 600-band student from a 700-band student. Treat any miss in this subtopic as a signal to drill the subtopic page before you do another full practice test.