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Question 511 Mark

Number of angles less than $180^\circ $ in Fig. is ______ and their names are ______.

Answer

Number of angles less than $180^\circ $ in Fig. is $12$ and their names are: $\angle\text{OAB},\angle\text{OBA},\angle\text{OAC},\angle\text{OCA},\angle\text{OCD},\angle\text{ODC}$
$\angle\text{AOB},\angle\text{AOC},\angle\text{COD},\angle\text{DOB},\angle\text{BAC},\angle\text{ACD}.$

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Question 521 Mark

The common part between the two angles $BAC$ and $DAB$ in Fig is ______ .

Answer

The common part between the two angles $BAC$ and $DAB$ in Fig is Ray AS.
Solution: Since, the common part between $\angle\text{DAB}$ and $\angle\text{BAC}$ is ray $AB.$

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Question 531 Mark

In Fig. how many line segments are there? Name them.

Answer

There are six line segments, namely $AB, AC, AD, BC, BD$ and $CD.$

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Question 541 Mark

Name the line segments shown in Fig.'

Answer

There are five line segments in the given figure, namely $AB, BC, CD, DE$ and $EA.$

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Question 551 Mark

The number of common points in the two angles marked in Fig. is ______.

Answer

The number of common points in the two angles marked in Fig. is $2.$
Solution: The common points in the $\angle\text{PDQ}$ and $\angle\text{PAQ}$ are $P$ and $Q.$

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