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#88 of about 120, 6 letters

Alpha particle emitter, 6 letters

Curie discovery, 6 letters

Decaying metal, 6 letters

Discovery of 1898, 6 letters

Element discovered by the Curies, 6 letters

Element discovered in 1898, 6 letters

Marie Curie material, 6 letters

Pitchblende product, 6 letters

An intensely radioactive metallic element that occurs in minute amounts in uranium ores, 6 letters

Decaying substances, 7 letters

Area determinant, 6 letters

Bicycle spoke, for example, 6 letters

Center-to-perimeter line, 6 letters

Circle line, 6 letters

Circle part, 6 letters

Distance on a radar screen, 6 letters

Figure that's squared in a common formula, 6 letters

Forearm bone, 6 letters

Half a diameter, 6 letters

Half measure, 6 letters

Half the diameter, 6 letters

Line from the center, 6 letters

Line from the center to the perimeter of a circle, 6 letters

Line in a circle, 6 letters

Range of operation, 6 letters

Spoke, 6 letters

Spoke, e.g., 6 letters

The r of pi r squared, 6 letters

The R in pi*R^2, 6 letters

Ulna neighbor, 6 letters

What r can mean, in geometry, 6 letters

The length of a line segment between the center and circumference of a circle or sphere, 6 letters

A straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere), 6 letters

The outer and slightly shorter of the two bones of the human forearm, 6 letters

Support consisting of a radial member of a wheel joining the hub to the rim, 6 letters

Arm bones, 8 letters

Circle lines, 8 letters

Circle segments, 8 letters

Circle segments (Var.), 8 letters

Geometric lines, 8 letters

Some geometry class lines, 8 letters

Sphere measures, 8 letters

Spokes, e.g., 8 letters

Some bones, 15 letters

Bone site?, 13 letters

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