Perimeter And Area

The perimeter of a circle is also known as the ______of the circle

• area

• arc

• circumference

Choose the correct formulas for the circumference of the circle.

• 
  

  $C\ =\ 2\pi r$

• $C\ =\ 2\pi d$

• $C\ =\ \pi d$

Ratio of circumference to diameter is a constant and it is denoted as ____.

• $pi\left(\pi\right)$

• $\inf inite\left(\infty\right)$

• $alpha\left(\alpha\right)$

Choose the correct approximate value of

 $\pi$  

•  $\frac{22}{7}$  

•  $0$  

•  $3.14$  

Can you say that the circumference of a circle is always more than three times its diameter?

• Yes

• No

Find the circumference of a circle of radius diameter 35 cm.

 $Take\ \pi\ =\ \frac{22}{7}$  

• 110 cm

• 55 cm

• 100 cm

Find the area of a circle whose radius is 21 cm.

 $$Take\pi =\frac{22}{7}$$ 

 

• $132\ cm^2$

• $1836\ cm^2$

• $1386\ cm^2$

Two or more circles with same centre but different radii are known as _______.

• co-centric circles

• concentric circles

• intersecting circles

The area of a square with each side as 100 m will be ____.

• $1000\ m^2$

• $10,000\ m^2$

• $1\ hectare$

 $Area\ 80850\ m^2\ =\ ----\ ha$  

• 8.0850 ha

• 80.850 ha

• 808.50 ha