Challenge 1: Creating a Precisely Sized Icon With an Exact Corner Radius — Solution Walkthrough

The answer:

Per this chapter's own material, a single click with the Rectangle
tool (rather than a drag) opens a dialog box for exact numeric
dimensions — width, height, and corner radius can all be typed in
directly. Entering 64 pixels for both width and height, with an
8-pixel corner radius, produces the exact shape needed in one step,
with no risk of an inexact mouse-drag measurement.

Why this beats drawing by eye:

Dragging the Rectangle tool by hand and then trying to eyeball a
64-by-64 size with an 8-pixel radius introduces exactly the kind of
imprecision this chapter's own numeric-input section is meant to
avoid — small measurement errors that matter for an icon meant to
align precisely with a grid or design system.

Why this beats using the Pen tool from Chapter 3:

A rounded rectangle drawn point by point with the Pen tool would
require manually placing and curving four corners to match an exact
8-pixel radius — a far more error-prone process than the Rectangle
tool's own live, numerically adjustable corner handles.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that exact numeric requirements are correctly
matched to the Rectangle tool's own dialog-box input method, rather
than an imprecise drag or an unnecessarily manual Pen-tool approach.