810 was rounded to the nearest 10 what is the upper bound​

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

so the rectangle is 80cm (area)

now to find the area of a triangle.

base times height.

4 times 8.

your answer is 96cm.

hope this .

if i knew id you bro,, my bad