Question

Find the area of this semi-circle with radius,

r
= 4cm.
Give your answer as an expression in terms of
π

Answer 1

8π

Explanation:

1\2πr2

1/2×4×4=8

=8π

Answer 2

8π

Explanation:

General formula for area of a circle:

`\pi {r}^(2)`

the question asks for half of a coracle, namely, a semicircle. thus, we multiply the area of a full circle by half

`(1)/(2) * {4}^(2) * \pi`

= 8π