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| Radioactive waste
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Materials left over from making nuclear energy. Radioactive waste can living organisms if it is not stored safely. |
| Radius
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The distance from the center of a circle to the circumference. One-half of the diameter of a circle. |
| Radius gauge
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A tool used for checking the radii of convex and concave surfaces. |
| Radon
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Radioactive gas that seeps into some homes, from the ground, through sump pumps, cracks in the foundation, etc., it is considered a health hazard. |
| Rafter
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Any of the beams that slope from the ridge of a roof to the eaves to serve as support for the roof. |
| Rafter anchor
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A metal fastener attached to the top plate of a wall to hold a rafter. |
| Rafter overhang
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The end of a rafter extending beyond the line of a building's walls. |
| Rafter pattern
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A guide used when cutting rafters. |
| Rafter plate
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The top plate of a building's walls. The rafters rest on the rafter plate. |
| Rafter plumb cut
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The vertical cut made into a rafter so it will rest on the wall plate. |
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