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Euclid's Definitions

Boundaries of...

Question

Boundaries of solids are
(a) lines
(b) curves
(c) surfaces
(d) none of these

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Solution

(c) surfaces

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Q. The tangent of the angle between the lines whose intercepts on the axes are a, –b and b, –a respectively, is

(a)

\frac{a^{2} - b^{2}}{a b}

\frac{b^{2} - a^{2}}{2}

\frac{b^{2} - a^{2}}{2 a b}

(d) none of these

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