public boolean inRegion(Block block) {
        Objects.requireNonNull(block, "block");
        return block.getLocation().distanceSquared(this.center.toLocation()) < this.radius * radius;
    }
Determines if the specified {@link Block} is within the region
@param block target block
@return true if the block is in the region
helper/src/main/java/me/lucko/helper/serialize/CircularRegion.java