Answer:
50) i. C 800cm^2
50)ii. B 120cm
Explanation:
Use the picture in its given 2-d to mark the unknown measures. Such as, the gray rectangle on top has a bottom that is also 20 and the left side is 15.
The small horizontal jutting out on the left mid-way down is 5cm same as the 5cm just below.
When you mentally "unfold" the shape to its full rectangular shape and size, all the lengths are marked.
Use:
Area=length×width
and,
Perimeter
=L + w + L + w
There are lots of perimeter formulas, for perimeter, you just add up all the sides all the way around the shape.
see image.