AI
DO
LEARN
Home
Subjects
Toolbox
Practice
Profile
Search
Ctrl K
繁體中文
Mathematics
/
Beginner
/
Grade 3 · Autumn
/
Rectangles and squares
Rectangles and squares
3 Knowledge points
Estimated time · 22 min
0%
01
Features of quadrilaterals
Equal opposite sides, right angles
7 min
Continue
02
What perimeter means
The total distance around
7 min
Continue
03
Perimeter formulas
(a+b)×2 and 4a
8 min
Continue