Question

math ncert class 7 ch 12 and 6​

Answer 1

Answer:

Q 1

1. b

2. a

3. b

4. c

5. d

Q2

1)

First find the degree of the third angle

let's take the third angle as y

50° + 70° + y = 180°

120° + y = 180°

y = 180° - 120°

y = 60°

Now,

A straight is always 180°

So,

60° + x = 180°

x = 180° - 60°

x = 120°

5) Altitude = an altitude of a triangle is the perpendicular drawn from a vertex to the opposite sides.

sorry, I don't know the others, and all the answers are right ✨

Answer 2

Q-1 Choose the correct option.

(1) Co-efficient of x in 3xy² is $\sf\underline{3y²}$.

➻ A coefficient is any number or quantity that is placed before a variable.

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(2) -3y² and 4y³ are $\sf\underline{unlike}$ terms.

➻ They are unlike terms as constant and the exponent are different in both the terms‎.

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(3) A quantity which has a $\sf\underline{fixed}$ numerical value is called a constant.

➻ Constant in a sense ‎means persistent in more simple terms it means continuous i.e., fixed.

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(4) In an equilateral triangle, each angle has measure $\sf\underline{60°}$.

‎➻ In an equilateral triangle all the three sides as well as three angles are equal.

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(5) In a right angled triangle, the side opposite to the right angle is called the $\sf\underline{hypotenuse}$.

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Q-2 Do as directed.

(1) Given, Two angles are 50° and 70°

We know,

$\sf\:Exterior~angle~=~Sum~of~interior~opposite~angles$

$\tt\leadsto\:x = (50 + 70)°$

$\tt\leadsto$ $\small\red{\tt\pmb{x=120°}}$

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(2) x and y are the numbers.

⠀⠀Square of x is x² and that of y is y².

⠀ Sum of the squares of x and y,

⠀⠀⠀⠀⠀⠀⠀⠀$\bf\::\implies\:x²+y²$

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(3) (a) -29x and -29y

They are $\sf\:{Unlike~terms}$ as they have different variables.

⠀⠀(b) 1, 100

They are $\sf\:{Like~terms}$ as both are constant, i.e., their values are fixed.

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(4) Given expression, 5xy² + 7x²y

Terms in the expression, 5xy² and 7x²y

⠀⠀⠀⠀Factors in 5xy² $\sf\:\twoheadrightarrow\:5 , x , y~and~ y$.

⠀⠀⠀⠀Factors in 7x²y $\sf\:\twoheadrightarrow\: 7 , x , x ~and~ y$.

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(5) (a) $\sf\:Altitude$ : In simplier terms altitude means height. The distance between the base and the vertex in a triangle gives us the value of altitude.

⠀⠀(b) $\sf\:Angle~sum~property~of~a~triangle$ : According to this the sum of all the angles in a triangle is equal to 180°.

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