8 pages matching right angles in this book
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abacus abbreviation algebra ANSWERS TO QUIZ Arabic arch arrangements astronomer calculate called camels century B.C. circle circumference column common common logarithms cube curve cyclic quadrilateral cycloid decimals derived Descartes diagonals diameter digits distance divided division dollar ellipse equal equation feet figure five four Galileo geometry girls given graph Greek word meaning Hence hour instrument invented Isaac Newton Leibnitz length Leonardo of Pisa letter logarithms mathe mathematician mathematics matics measure meters mid-points miles Mobius band multiplication Napier Newton nine number of days Oughtred ounce parabola parallelogram Pascal pentagon pentagram Pisa plane pound problem Pythagoras question radius ratio right angles right-angled triangle Robert Recorde Roman numerals scores 40 semicircle sides slide rule solution star straight line subtraction symbol tangent term theorem tion trigonometry unit variable quantity weight William Oughtred writing yards