Question

find the length of rectangle if B and they are given. 1) b=300cm,a=600cm² 2) b=300cm,a=1200cm² 3) b=800cm,a=1400cm² 4) b=700cm,a=2100cm² 5) b=950cm,a=2500cm² 6) b=700cm,a=1450cm² ​

Answer 1

Answer:

1.

• breadth = b = 300 cm,
• area = a = 600 cm²
• length = l

Area of rectangle = l × b

⇒ 600 cm² = l × 300 cm

⇒ $\dfrac{600}{300}$ = l

⇒ 2 cm = l

2.

• Breadth = b = 300 cm
• Area = a = 1200 cm²
• Length = l

Area of rectangle = l × b

⇒ 1200 cm² = l × 300

⇒ $\dfrac{1200}{300}$ = l

⇒ 4 cm = l

3.

• Breadth = b = 800 cm,
• Area = a = 1400 cm²
• Length = l

Area of rectangle = l × b

⇒ 1400 cm² = l × 800

⇒ $\dfrac{1400}{800}$ = l

⇒ 1.75 cm = l

4.

• Breadth = b = 700 cm,
• Area = a = 2100 cm²
• Length = l

Area of rectangle = l × b

⇒ 2100 cm² = l × 700

⇒ $\dfrac{2100}{700}$ = l

⇒ 3 cm = l

5.

• Breadth = b = 950 cm,
• Area = a = 2500 cm²
• Length = l

Area of rectangle = l × b

⇒ 2500 cm² = l × 950

⇒ $\dfrac{2500}{950}$ = l

⇒     $\dfrac{50}{19}$ cm   = l

6.

• Breadth = b = 700 cm,
• Area = a = 1450 cm² ​
• Length = l

Area of rectangle = l × b

⇒ 1450 cm² = l × 700

⇒ $\dfrac{1450}{700}$ = l

⇒ $\dfrac{29}{14}$ cm = l