Question

give answers of these questions​

Answer 1

AnswEr 5 :

$\underline{\dag\:\textsf{General \: form \: of \: linear \: equation:}}$

$\large\ : \implies{\boxed{\sf{ ax + by + c = 0}}}$

$\bullet$ Here a, b and c are real numbers.

$\bullet$ Block the values(x = 1, y =2),in general form of linear equation:-

$\normalsize\ : \implies\sf\ a(1) + b(2) + c = 0 \\ \\ \normalsize\ : \implies\sf\ a + 2b + c = 0$

$\bullet$ There can be different values for a,b and c which satisy the equation.Hence, there can be infinitely many solutions which can satisfy the equation.

$\large\ : \implies{\boxed{\sf \red{ Option D \: is \: correct}}}$

AnswEr 6 :

$\bullet$ Two figures have same shape and size are congruent.Hence ;

$\large\ : \implies\sf{\boxed{\sf \blue{Option D \: is \:correct}}}$

AnswEr 7 :

$\bullet$ If sides of a triangle are given,then we find the area of triangle by using "Heron's formula".

$\bullet$ Also; Sum of two sides is equal to the third side. but it is not possible here,as:-

$\normalsize\ : \implies\sf 10 = 5+3 \\ \\ \normalsize\ : \implies\sf\ 10 ≠ 8$

$\bullet$ Hence; the correct option is unable to form a triangle so no area can be calculated.

$\large\ : \implies{\boxed{\sf \pink{OptionD \: is \: correct}}}$

AnswEr 8 :

$\underline{\dag\:\textsf{Euclid's \: postulates:}}$

1) A straight line may be drawn from one point to another point.

2) A circle can be made with any centre or any any radius.

3) All right angles are equal to one another.

4) A terminated line can be produced indefinitely.

5) If a straight line falling on a straight line makes the interior angle of the same side of it taken together less than two right angles,then the two straight lines, if produced indefinitely meet on that side on ehich sum of angles is lesz than two right angles.

$\bullet$ Hence ; from above statements we can conclude that "there are total 5 postulates".

$\large\ : \implies{\boxed{\sf \orange{OptionA \: is \: correct}}}$

AnswEr 9 :

$\bullet$ It is given that <R = <P and QR = 4cm.Here, PQ = QR because ;

$\: \: \: \normalsize\sf\ (Sides \: opposite \: to \: equal \: angles \: are \: equal)$

$\normalsize\ : \implies\sf\ PQ = QR = 4cm$

$\large\ : \implies{\boxed{\sf \purple{OptionA \: is \: correct}}}$

AnswEr 10 :

$\bullet$ The sum of probabilities of all elementary events is 1 .Hence;

$\large\ : \implies{\boxed{\sf \green{OptionA \: is \: correct}}}$

AnswEr 11 :

$\bullet$ Great Mathematician Euclid stated that All the right angles are equal to one another in the form a postulate.

$\large\ : \implies{\boxed{\sf \red{ Euclid }}}$

AnswEr 12 :

$\bullet$ If two sides of a triangle are unequal then the angle opposite to longer side is larger.

$\large\ : \implies{\boxed{\sf \blue{ Larger}}}$

AnswEr 13 :

$\bullet$ The longest chord of the circle is Diameter.

$\large\ : \implies{\boxed{\sf \pink{Diameter }}}$