Question

Find the diameter of circle whose circumference is 66m.​

Answer 1

Answer:

Let the diameter of a circle be d m

Given circumference of the circle is 66 m

⟹πd=66

⟹

7

22

×d=66

⟹d=

22

66×7

=21 m

So the diameter is 21 cm

Answer 2

Answer:

ANSWER

3x+2y=7

4x+y=6⇒y=6−4x

placing in equation (1)

3x+2(6−4x)=7

3x+12−8x=7⇒−5x+12=7

−5x=7−12⇒−5x=−5

x=1

∴ y = 6 - 4×1=2

∴ x = 1, y = 2