KanjiJLPT N1
Arc

arc, arch, bow

Mnemonic

You draw back your bow and launch a whole melon skyward. It traces a gorgeous arc overhead, juice streaming behind it like a comet's tail, before crashing down in a sticky explosion. The arc of the melon perfectly mirrors the curve of the bow that sent it flying.
Additional thoughts
Picture the bow's curve matching the melon's flight path—both are arcs. The melon's trajectory is the geometric arc connecting launch to landing.
Quick recall
A bow launches a melon in a perfect arc across the sky.

Details

The keyword for 弧 is arc. This kanji refers to the curved segment of a circle or any bow-shaped curve, as used in geometry and mathematics. It evokes the image of something bent in a smooth, continuous curve, much like the shape of a drawn bow. The concept extends to any partial curve forming part of a circular or rounded shape.
On'yomi