Question

Please make an explanation, I haven’t learned much on this before

Answer 1

Triangle: 4

Trapezoid: 3.8

Explanation:

All you need to find is what of the three or four adds to the perimeter

3+5 is 8

So 12-8 is 4

So the ? is 4

8.3 plus 3.8 plus 8.3 is 20.4

24.2-20.4 is 3.8

Hope this helps!