Question

Ch - 11
Constructions

Class 9th

please answer with explaination. ​

Answer 1

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1.)Which of the following angle can be constructed with the help of a ruler and a pair of compasses?

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90°

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2.)Which of these angles cannot be constructed using ruler and compasses?

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140°

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3.)Which of the following can be the length of BC required to construct the triangle ABC such that AC = 7.4 cm and AB = 5 cm?

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2.1 cm

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4.)The construction of a triangle ΔABC in which BC = 6 cm, ∠A = 50° is not possible, when difference of BC and AC is equal to

${\large{\bold{\sf{\bf {\underline{Answer}}}}}}$

6.4 cm

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5.)The construction of the triangle ABC is possible if it is given that BC = 4 cm, ∠C = 60° and the difference of AB and AC is

${\large{\bold{\sf{\bf {\underline{Answer}}}}}}$

4.5 cm

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6.)Which of the following set of lengths can be the sides of a triangle?

${\large{\bold{\sf{\bf {\underline{Answer}}}}}}$

5.5cm, 6.5cm, 8.9cm

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7.)Which of the following sets of angles can be the angles of a triangle?

${\large{\bold{\sf{\bf {\underline{Answer}}}}}}$

40°,60°,70°

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Answer 2

Answer:

1.)Which of the following angle can be constructed with the help of a ruler and a pair of compasses?

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Answer

90°

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Question:−

2.)Which of these angles cannot be constructed using ruler and compasses?

{\large{\bold{\sf{\bf {\underline{Answer}}}}}}

Answer

140°

\Large{\underline{\rm{\green{Question:-}}}}

Question:−

3.)Which of the following can be the length of BC required to construct the triangle ABC such that AC = 7.4 cm and AB = 5 cm?

{\large{\bold{\sf{\bf {\underline{Answer}}}}}}

Answer

2.1 cm

\Large{\underline{\rm{\green{Question:-}}}}

Question:−

4.)The construction of a triangle ΔABC in which BC = 6 cm, ∠A = 50° is not possible, when difference of BC and AC is equal to

{\large{\bold{\sf{\bf {\underline{Answer}}}}}}

Answer

6.4 cm

\Large{\underline{\rm{\green{Question:-}}}}

Question:−

5.)The construction of the triangle ABC is possible if it is given that BC = 4 cm, ∠C = 60° and the difference of AB and AC is

{\large{\bold{\sf{\bf {\underline{Answer}}}}}}

Answer

4.5 cm

\Large{\underline{\rm{\green{Question:-}}}}

Question:−

6.)Which of the following set of lengths can be the sides of a triangle?

{\large{\bold{\sf{\bf {\underline{Answer}}}}}}

Answer

5.5cm, 6.5cm, 8.9cm

\Large{\underline{\rm{\green{Question:-}}}}

Question:−

7.)Which of the following sets of angles can be the angles of a triangle?

{\large{\bold{\sf{\bf {\underline{Answer}}}}}}

Answer

40°,60°,70°

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