Question

Solve q 7 correctly ​

Answer 1

Answer:

The lengths of the sides of the given rectangle are 21 , 12 , 21 and 12 units.

Step-by-step explanation:

In a rectangle, the parallel sides are of equal length.

So,

7a = b + 18

⇒ b = 7a - 18

4a = b + 9

⇒ 4a = 7a - 18 + 9

⇒ 4a = 7a - 9

⇒ 7a - 4a = 9

⇒ 3a = 9

⇒ a = 9/3

⇒ a = 3

∴ The value of a is 3.

⇒ b = 7a - 18

⇒ b = 7(3) - 18

⇒ b = 21 - 18

⇒ b = 3

Therefore, the lengths of the sides are

• 7a = b + 18 = 21
• 4a = b + 9 = 12