What is the perimeter of a semicircle with a base of 0.7 m?

The shape is a semicircle with a straight base.
The length of the straight base is given as 0.7 m. This also represents the diameter of the semicircle.
The radius of the semicircle is half of the diameter: $r = \frac{0.7 \text{ m}}{2} = 0.35 \text{ m}$.

The curved part is a semicircle, so its length is half the circumference of a full circle. The formula for the circumference of a full circle is $C = 2\pi r$.
Length of curved part $L_{curve} = \frac{1}{2} \times 2\pi r = \pi r$.
Using $\pi \approx 3.14$:

The total perimeter of the shape is the sum of the length of the curved part and the length of the straight base.

The perimeter of the shape is $\text{1.799 m}$.