Answer:
and

Explanation:
(a)
A =
× 4
×

= 2
×

=
×
← rationalise the denominator
=
units²
(b)
Using Pythagoras' identity in the right triangle
let hypotenuse be h , then
h² = (4
)² + (
)²
= 32 +

=
+

=
( take the square root of both sides )
h =
=
×
← rationalise the denominator
h =
