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storchak [24]
2 years ago
13

How do I find the area of the non-shaded figure?!?

Mathematics
2 answers:
Rainbow [258]2 years ago
6 0

Answer:

Answer:

51 cm²

Step-by-step explanation:

Rectangle = 6x12=72

triangle = 1/2(7)(6)=21

Non-shaded=72-21=51 cm²

Usually, we would subtract the area of a smaller inner shape from the area of a larger outer shape in order to find the area of the shaded region

gtnhenbr [62]2 years ago
5 0

Answer:

51 cm²

Step-by-step explanation:

rectangle = 6x12=72

triangle = 1/2(7)(6)=21

Non-shaded=72-21=51 cm²

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OK, so the graph is a parabola, with points x=0,y=0; x=6,y=-9; and x=12,y=0

Because the roots of the equation are 0 and 12, we know the formula is therefore of the form

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The key property of a parabolic dish is that it focuses radio waves travelling parallel to the y axis to a single point. So we should arrive at the same focal point no matter what point we chose to look at. So we can pick any point we like - e.g. the point x = 4, y = -8

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So the gradient of the normal to the mirror at x = 4 is therefore 1.

Radio waves initially travelling vertically downwards are reflected about the normal - which has a gradient of 1, so they're reflected so that they are travelling horizontally. So they arrive parallel to the y axis, and leave parallel to the x axis.

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