answer for 7,10 and 11
this is for class 7th grade!
chapter-5 lines and angles.
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Answers
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Answer:
11.Two angles are Adjacent when they have a common side and a common vertex (corner point) and don't overlap. Because: they have a common side.
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qus. 7. Can two angles be supplementary if both of them are:
(i). Acute?
Solution:-
No. If two angles are acute, means less than 90o, the two angles cannot be supplementary. Because, their sum will be always less than 90o.
(ii). Obtuse?
Solution:-
No. If two angles are obtuse, means more than 90o, the two angles cannot be supplementary. Because, their sum will be always more than 180o.
(iii). Right?
Solution:-
Yes. If two angles are right, means both measures 90o, then two angles can form a supplementary pair.
∴90o + 90o = 180
qus. 10 Indicate which pairs of angles are:
(i) Vertically opposite angles.
Solution:-
By observing the figure we can say that,
∠1 and ∠4, ∠5 and ∠2 + ∠3 are vertically opposite angles. Because these two angles are formed by the intersection of two straight lines.
(ii) Linear pairs.
Solution:-
By observing the figure we can say that,
∠1 and ∠5, ∠5 and ∠4 as these are having a common vertex and also having non common arms opposite to each other.
11. In the following figure, is ∠1 adjacent to ∠2? Give reasons.
Solution:-
∠1 and ∠2 are not adjacent angles. Because, they are not lie on the same vertex.