================================================== ========

Question （1）

================================================== ========

Area of circle= A

Area=╥R²

Radius = 1/√╥

A=╥(1/√╥)²

=╥ * 1/╥

A= ╥

Correction

A=╥(1/√╥)²

=╥ * 1/╥

=1

Therefore rational because can be express as a fraction.

Correction

Therefore it is rational because 1 can be express as 1/1 where both numerator and denominator is an integer.

================================================== ========

Question 2

================================================== ========

Find side length of Square.

Let side length of square =S

Given only diagonal length = √72 cm

(√72)²=2S²

72=2S²

72/2=S²

36=S²

√36=S

6=S

Therefore rational because can be express as a fraction.

Correction

Therefore it is rational because 6 can be express as 6/1 where both numerator and denominator is an integer.

================================================== ========

I have been prompted to provide reasons besides stating rational or irrational.

May i know is the above correct ? Especially Question 2 because i suspect that my answer might be wrong.

================================================== ========