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AC is equal angle ABC angle BAC apotome axis base binomial straight line bisected centre of gravity circle ABCD circumference circumscribed commensurable in length commensurable in square cone continued proportion cube cylinder diameter double equal angles equiangular equilateral equimultiples figure fluid frustum gnomon height incommensurable inscribed joined less let the square magnitudes mean proportional medial area medial straight line multiplying parabola paraboloid parallelogram pentagon perpendicular plane of reference polygon prime prism produced Prop Proposition 13 proved pyramid q. e. d. Proposition radius rational straight line rectangle AC rectangle contained remaining angle right angles side similar Similarly sphere spheroid square number squares on AC straight lines commensurable superparticular surface tangent triangle ABC twice the rectangle vertex whole