Question

Short Answer Type Questions :-

1. The base of a parallelogram is 4 cm. Its area is 12 cm². What is the length of its height?

2. The side of a square is 1.5 cm. What is its area?

3. The area of a rectangle is 20 cm². If its length is 5 cm, what is its breadth?

4. The area of a right-angled triangle is 20 cm². If its altitude is 4 cm, then what is its base?

5. The radius of a circle is 2 cm. What is its circumference?

6. The diameter of a circle is 1 cm. What is its circumference?

7. What is the area of a circle whose radius is 7 cm?

8. What is the area of a circle whose diameter is 2 cm?​

Answer 1

Answer:

1. 3cm

2. Square of 1.5cm  =  2.25cm square

3. 4cm

4.

5. 4pi

6. 3.142

7. 153.938

8. 3.142

Step-by-step explanation:

Please mark my answer as brainlisted...!!

Answer 2

Answers:

1) Base of the parallelogram = 4 cm

Area = 12 cm²

Formula for area of a parallelogram = bh

b x 4 = 12 cm²

b = 12/4 = 3 cm

2) Side, a = 1.5 cm

Area of a square = a²

= 1.5 x 1.5 = 2.25 cm²

3) Area of the rectangle = 20 cm²

Length = 5 cm

Formula for area of a rectangle = lb

5 x b = 20 cm²

b = 20/5 = 4 cm

4) Area of the right angled triangle = 20 cm²

Altitude = 4 cm

Formula to find area of a right angled triangle = 1/2bh

$\sf{\dfrac{1}{2}\times\:b\times4=20\:cm^2}$

2b = 20 cm²

b = 20/2 = 10 cm

5) Radius = 2 cm

Formula to find circumference of circle = 2πr

Circumference = $\sf{2\times\dfrac{22}{7}\times2}$

= 12.57 cm

6) Diameter = 1 cm

Radius = 1/2

Formula to find circumference of circle = 2πr

Circumference = $\sf{2\times\dfrac{22}{7}\times\dfrac{1}{2}}$

Circumference = $\sf{\dfrac{22}{7}}$

= 3.14 cm

7) Radius = 7 cm

Formula to find area of a circle = πr²

Area = $\sf{\dfrac{22}{7}\times7\times7}$

Area = 22 x 7 = 154 cm²

8) Diameter = 2 cm

Radius = 2/2 = 1 cm

Formula to find area of a circle = πr²

Area = $\sf{\dfrac{22}{7}\times1\times1}$

Area = 22/7

Area = 3.14 cm²

★ Final Answers:

1) 3 cm

2) 2.25 cm

3) 4 cm

4) 10 cm

5) 12.57 cm

6) 3.14 cm

7) 154 cm²

8) 3.14 cm²