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Let's do this question, because you are this is a square we are an issue intersect at all, and I'm

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going to be OK.

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You is watching the video.

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Give it a try and then let's do it together.

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All right.

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We are back, but we have over here Squire P Q r us and the diagonal Spearin Askew are intersecting

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at all.

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Now, the angle over here and B or Q is what we need to find.

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And we know that diagonals of a square are perpendicular bicyclers of each other.

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Therefore, for this angle over here is a 90 degree angle.

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Right.

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Therefore the correct answer is option it.

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All right, let's do the next question.

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Construct a unique problem.

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The minimum number of measurements required is so how many measurements do you need to construct a parallelogram,

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give it a thought and then let's do it together.

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All right.

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Let's do it together.

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You need a minimum of three measurements.

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That is two not parallel sides and one angle to construct a program.

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For example, if you have two non parallel sides giving us A and B, and you know that one angle is

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equal to, say, 60 degrees, then you're able to construct it.

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For example, you can select E over here, then you draw a line at this point at sixty degrees and you

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cut off A measurement of B over here using your compass.

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Now you construct this parallel line through this point parallel to this line and you measure out over

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here.

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And you get a point over here and you join these two together in this way, you are able to construct

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a program, but you need a minimum of three measurements to construct this parallelogram.