Well, darling, the instrument you're looking for is a ruler or a caliper. These bad boys are perfect for measuring the sides of a regular solid like a cube or a rectangular prism. So, whip out that ruler and get measuring, honey!
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A regular (3D) solid could be a cube or cuboid, and a rigid plastic ruler (as used in a school) or tape measure could be used. A sphere could be measured by a flexible tape measure around it widest circumference, as used in tailoring. Nowadays, there are instruments that use a laser beam to measure regular and irregular 3D shapes.
A protractor can be used to measure an angle.
The instrument you are looking for is a compass
The instrument used to measure a angle is called a protractor!
A protractor.
The sundial