Answer:
1st question: a. 12
2nd question: b.

3rd question: a. 42°
Explanation:
For 1st Question:
∡KLM = 90°
Since all the interior angle of the rectangle is 90°.
In ΔKLM
∡KML + ∡MKL +∡KLM =180°
Since the sum of an interior angle of a triangle is 180°
Substituting value,
(2x+4)°+62°+90°=180°
2x+4+152 = 180
2x + 156 = 180
2x = 180-156
2x=24

x=12
Therefore, the value of x is a. 12.

For 2nd Question:
Given:
Diagonal of square (c)= 14 cm
To find:
Length of side = ?
As we know that,
The diagonal of a square is the line that connects two opposite corners of the square. It is the longest line in the square.
The length of the diagonal of a square is related to the length of the sides of the square by the Pythagorean Theorem.
Let side of side be a.
By using Pythagoras' rule:

where,
- a and b are the side of the right-angled triangle
- c is the hypotenuse or longest side
Here,
a = b side of the square is equal.
Now,
substituting value

Therefore, the length of the side of the square is b.


For 3rd Question:
Let's answer this by naming. See the attachment
Here,
Given:
Streets are Parallel.
That means: AB ║BC
∡CEH = 132°
∡HCF = 90°
To find:
∡GHF = x
Solution,
Here,
∡CEH + ∡HFG = 180°
Sum of co interior angle is 180°
Substituting value,
132° + ∡HFG = 180°
∡HFG = 180° - 132°
∡HFG = 48°
Again
In the Right-Angled triangle FGH
∡GHF +∡HCF+ ∡HFG = 180°
Since the sum of an interior angle of a triangle is 180°.
Substituting value,
x+90°+48°=180°
x +138° = 180°
x= 180°-138°
x = 42°
Therefore, value of x is a. 42°