Question

The length of a rectangular hall is 7 meters less than 2 times the breadth of the hall. What is the length, if the breadth is b meters? Score: 1

Answer 1

Answer

1. Draw a line BC=5cm

2. Construct 40

o

at B. Extend BP.

3. Take 2.8cm on a compass and cut an arc on BP. Join CX.

4. Take a perpendicular bisector of CX. It intersects with BP at A.

5. Join AC

Answer 2

Step-by-step explanation:

We know that 2(l+b) is the perimeter for rectangle then

L= 2b-7

b=b

Perimeter = 2(2b-7+b) => 2(2b+b-7)

= 6b - 14

now we know perimeter = 6b - 14

since 6b - 14 = 2(l+b)

6b - 14 = 2(2b-7+b)

6b - 14 = 2(3b-7)

the length is 2b-7