Question

a school is decided to paint its inner
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Answer 1

The complete question is

A school decided to paint its inner boundary wall. They planned to write quotations and social messages for the children on the circular areas of radius 35 cm each on the wall along a straight line. If the boundary wall is 210m long,

(a) How many circles can be drawn?

(b) Find the area of the circle.

Step-by-step explanation:

Given, the radius of each circle is 35 cm

Then its diameter is (2 × 35) cm = 70 cm

Thus the number of circles that can be drawn on the wall of length 210 m is (210 ÷ 70) = 3 (three).

We know that, if r is the radius of a circle, its area is given by $\pi r^{2}$

Therefore the area of the circle of radius 35 cm is

$\quad \pi \times 35^{2}\:cm^{2}$

$=\frac{22}{7}\times 35\times 35\:cm^{2}$

$=22\times 5\times 35\:cm^{2}$

$=3850\:cm^{2}$

Here the value which students have to remember is

$\quad \pi=\frac{22}{7}$

Answer 2

Answer:

210m = 21000cm

no of circles = 21000/70 = 300 circles

area = pie r^2 = 22/7 * 35. * 35 = 3850 cm^2