Area builder
Build connected shapes with a fixed area. Match a target perimeter, or find the smallest or largest possible perimeter.
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Your answers are saved in this tab. Continue from where you left off.
Continuing uses no additional practice start.
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Your answers from this round will be discarded. You can choose your settings before starting a new round.
Starting the new round uses one practice start.
Match a target perimeter, or find the smallest or largest possible perimeter, on an open board.
1 puzzle · No time limit · Hints are available
Example
Example
Tap a square to change the shape.
Area 4 · Perimeter 8
- Answered
- 0 / 1
- Active time
- 0:00
- Correct answers
- Active time
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Optional and off by default. Share starts, completions, replays and error categories. For visits from ChatGPT, starts and completions can also include the first QuickenBrain page and broad country. No answers, drawings or names.
How this data is usedHelp
Tap squares to fill or clear them. Make one shape connected edge to edge, with no enclosed holes. Any shape that meets the targets is accepted.
Rounds ask you to match a target perimeter, or find the smallest or largest perimeter for a fixed area. The fixed squares, obstacles and symmetry still apply.
Each square adds 4 edges. A shared edge removes 2 from the perimeter. Ringed squares stay filled; crossed squares stay empty.
Keyboard: Tab to the board, move with the arrow keys, and press Space or Enter to change a square.
About this practice
Learn a method
Count area and perimeterBuild connected shapes with a fixed area. Match a target perimeter, or find the smallest or largest possible perimeter.
For a broader mix of practices, explore the geometry practice test. Membership is required to start a test.
Report a problem
Optional and off by default. Share starts, completions, replays and error categories. For visits from ChatGPT, starts and completions can also include the first QuickenBrain page and broad country. No answers, drawings or names.
How this data is used