This appears to be 2 two point perspective.
Perimeter-distance around a shape.
Rectangles have 4 sides, 2 pairs.
You could do-
29+29+15+15=58+30=88 meters
Or multiply each side by two and add.
29(2)=58
15(2)=30
58+30=88 meters is the distance around Mia's garden
Volume of cone : (1/3) * pi * r^2 * h
<span>35 = (1/3) * 3.14 * 2.4^2 * h </span>
<span>h = 35 / ((1/3) * 3.14 * 2.4^2) </span>
<span>h ≈ 5.805 in </span>
<span>h = 5.81 in
Hope this helps you </span>
The slope is 2/3 when simplified