Complete the following table by finding the diameter and the circumference of the circle. Radius r Diameter of the circle = 2 r Circumference of the circle π D 4 . 2 m

We know that, the diameter of the circle = 2 r , where r is the radius of the circle. The circumference of a circle = π D Given that, the radius of the circle r = 4 . 2 m Diameter of the circle D = 2 × 4 . 2 = 8 . 4 m Circumference of the circle = π D = 22 7 × 8 . 4 = 22 × 1 . 2 = 26 . 4 m Hence, the diameter of the circle is 8 . 4 m and the circumference of the circle is 26 . 4 m . Radius r Diameter of the circle = 2 r Circumference of the circle π D 4 . 2 m 8 . 4 m 26 . 4 m

Complete the following table by finding the diameter and the circumference of the circle. Radius r Diameter of the circle = 2 r Circumference of the circles π D 1 . 4 m

We know that, the diameter of the circle = 2 r , where r is the radius of the circle. The circumference of a circle = π D Given that, the radius of the circle r = 1 . 4 m Diameter of the circle D = 2 × 1 . 4 = 2 . 8 m Circumference of the circle = π D = 22 7 × 2 . 8 = 22 × 0 . 4 = 8 . 8 m Hence, the diameter of the circle is 2 . 8 m and the circumference of the circle is 8 . 8 m . Radius r Diameter of the circle = 2 r Circumference of the circles π D 1 . 4 m 2 . 8 m 8 . 8 m

Complete the following table by finding the diameter and the circumference of the circle. Radius r Diameter of the circle = 2 r Circumference of the circle π D 63 cm

We know that, the diameter of the circle = 2 r , where r is the radius of the circle. The circumference of a circle = π D Given that, the radius of the circle r = 63 cm Diameter of the circle D = 2 × 63 = 126 cm Circumference of the circle = π D = 22 7 × 126 = 22 × 18 = 396 cm Hence, the diameter of the circle is 126 cm and the circumference of the circle is 396 cm . Radius r Diameter of the circle = 2 r Circumference of the circle π D 63 cm 126 cm 396 cm

Complete the following table by finding the diameter and the circumference of the circle. Radius r Diameter of the circle = 2 r Circumference of the circle π D 49 cm

We know that, the diameter of the circle = 2 r , where r is the radius of the circle. The circumference of a circle = π D Given that, the radius of the circle r = 49 cm Diameter of the circle D = 2 × 49 = 98 cm Circumference of the circle = π D = 22 7 × 98 = 22 × 14 = 308 cm Hence, the diameter of the circle is 98 cm and the circumference of the circle is 308 cm . Radius r Diameter of the circle = 2 r Circumference of the circle π D 49 cm 98 cm 308 cm

Complete the following table by finding the diameter, circumference and area of the circle. Radius of a circle Diameter of the circle Circumference of the circle Area of the circle 2 . 1 m

Given that, the radius of the circle r = 2 . 1 m We know that, the diameter of a circle = 2 r Diameter = 2 × 2 . 1 = 4 . 2 m We know that, the circumference of a circle = π D Therefore, the circumference of the circle = 22 7 × 4 . 2 = 22 × 0 . 6 = 13 . 2 m We know that, the area of a circle = π r 2 Area of a circle = 22 7 × 2 . 1 × 2 . 1 = 13 . 86 m 2 Hence, the diameter of the circle is 4 . 2 m , the circumference of the circle is 13 . 2 m and the area of the circle is 13 . 86 m 2 . Radius of a circle Diameter of the circle Circumference of the circle Area of the circle 2 . 1 m 4 . 2 m 13 . 2 m 13 . 86 m 2

Complete the following table by finding the diameter, circumference and area of the circle. Radius of a circle Diameter of the circle Circumference of the circle Area of the circle 4 . 9 m

Given that, the radius of the circle r = 4 . 9 m We know that, the diameter of a circle = 2 r Therefore, the diameter = 2 × 4 . 9 = 9 . 8 m We know that, the circumference of a circle = π D Circumference = 22 7 × 9 . 8 = 22 × 1 . 4 = 30 . 8 m We know that, the area of a circle = π r 2 Area of a circle = 22 7 × 4 . 9 0 . 7 × 4 . 9 = 22 × 0 . 7 × 4 . 9 = 75 . 46 m 2 Hence, the diameter of the circle is 9 . 8 m , the circumference of the circle is 30 . 8 m and the area of the circle is 75 . 46 m 2 . Radius of a circle Diameter of the circle Circumference of the circle Area of the circle 4 . 9 m 9 . 8 m 30 . 8 m 75 . 46 m 2

MEDIUM

7th CBSE

IMPORTANT

Earn 100

Two sides of a parallelogram are in the ratio of $7 : 3$ . If its perimeter is $80 c m$ , find the length of each of its sides.

Important Questions on Perimeter and Area

MEDIUM

7th CBSE

IMPORTANT

Next Maths 7 Book B>Chapter 4 - Perimeter and Area>Let Us Try 12.2>Q A5

The height of a triangle is thrice the length of its base. The length of the base of a triangle is

x c m

and the length of the other two sides is

24 c m

and

26 c m

. If the perimeter of the triangle is

60 c m

, find its height and area.

MEDIUM

7th CBSE

IMPORTANT

Next Maths 7 Book B>Chapter 4 - Perimeter and Area>Let Us Try 12.2>Q A6

The base and the height of a triangle are in the ratio of $4 : 5$ . If its area is $72.9 c m^{2}$ , find the lengths of the base and the height of the triangle.

EASY

7th CBSE

IMPORTANT

Next Maths 7 Book B>Chapter 4 - Perimeter and Area>Exercise

Complete the following table by finding the diameter and the circumference of the circle.

Radius $(r)$	Diameter of the circle $(= 2 r)$	Circumference of the circle $(π D)$
$4.2 m$

EASY

7th CBSE

IMPORTANT

Next Maths 7 Book B>Chapter 4 - Perimeter and Area>Exercise

Complete the following table by finding the diameter and the circumference of the circle.

Radius $(r)$	Diameter of the circle $(= 2 r)$	Circumference of the circles $(π D)$
$1.4 m$

EASY

7th CBSE

IMPORTANT

Next Maths 7 Book B>Chapter 4 - Perimeter and Area>Exercise

Complete the following table by finding the diameter and the circumference of the circle.

Radius $(r)$	Diameter of the circle $(= 2 r)$	Circumference of the circle $(π D)$
$63 cm$

EASY

7th CBSE

IMPORTANT

Next Maths 7 Book B>Chapter 4 - Perimeter and Area>Exercise

Complete the following table by finding the diameter and the circumference of the circle.

Radius $(r)$	Diameter of the circle $(= 2 r)$	Circumference of the circle $(π D)$
$49 cm$

MEDIUM

7th CBSE

IMPORTANT

Next Maths 7 Book B>Chapter 4 - Perimeter and Area>Exercise

Complete the following table by finding the diameter, circumference and area of the circle.

Radius of a circle	Diameter of the circle	Circumference of the circle	Area of the circle
$2.1 m$

MEDIUM

7th CBSE

IMPORTANT

Next Maths 7 Book B>Chapter 4 - Perimeter and Area>Exercise

Complete the following table by finding the diameter, circumference and area of the circle.

Radius of a circle	Diameter of the circle	Circumference of the circle	Area of the circle
$4.9 m$

Two sides of a parallelogram are in the ratio of 7:3. If its perimeter is 80 cm, find the length of each of its sides.

Important Questions on Perimeter and Area

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Two sides of a parallelogram are in the ratio of $7 : 3$ . If its perimeter is $80 c m$ , find the length of each of its sides.