A plane intersects only one nappe of a double-napped cone such that it is parallel to a generating line. Which conic section is formed? circle hyperbola parabola ellipse

For the first question, the cross section would form a circle since the plane is perpendicular to the vertical axis. When the plane is parallel to the generator line, the cross section would be an ellipse. On the other hand, a hyperbola is formed when the plane intersects only one nappe of a double-napped cone, and the plane is not parallel to the generating line of the cone. 

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it would be a parabola

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you need more information to answer this question

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c.   x=2.4cm

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similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

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to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.