TriviaMeasure

How far, from here?

You can measure distance with camera and your trivia.
And this tool has several presets, they will support you.

1. Set the size of target.
(Metric or Imperial, and set the decimal point between rolls.)

2. Fit the edge at the inside of ring with pinch gesture or zoom slider.
(Touch the center of ring, change the diameter of it.)

3.Answer.
(When you want to change the measurement system or units, touch the each labels they will be changed.)