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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.

The vowels have been taken out of some mathematical words. Can you work out the words: CB, RDS, DGNL, NGL, QLTRL, CN, CT, LGBR, VRG, RT, R ?

Answer: CUBE, RADIUS, DIAGONAL, ANGLE, QUADRILATERAL, CONE, ACUTE, ALGEBRA, AVERAGE, ROOT, AREA