Free online math practice
Plane geometry formulas Practice
Triangle, trapezoid, and circle areas, plus circle circumference.
Start practicingPlane geometry formulas
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What you’ll practice
Identify the shape and the meaning of each given length. A perpendicular height is not always a slanted side.
Where this helps
Choosing the right formula for common plane shapes.
Before you start
Use this topic to practice math you have already learned. The examples show the available kinds of recall tasks; this is not a complete textbook chapter. Check the answer form and any stated conditions.
Try a few examples
Real practice. Real progress.
Example 1 of 4
r is a nonnegative real radius.
Not drawn to scale
Choose the exact expression.
Grades and courses that include this topic
Related practice
Start practicingPlane geometry formulas
- Free to practice.
- No account required.
- Progress stays on this device.