Question

the arithmatic mean of a-2,a and a+2 is (with method)

Answer 1

Given: ABC is a right angled triangle and

AC=5cm,BC=12cm

AB=?

By Pythagoras theorem,

(Hypotenuse)^2= (Base)^2+(Perpendicular)^2

therefore, (AB)^2=(AC)^2+(BC)^2

AB=13cm

Answer 2

(a-2)+a+(a+2)/3

=3a/3

=a