2. area of square = side length × side length formula s = a× a.

3. area of rectangle = length× width formula s = a× b.

4. The area of parallelogram = base× height formula S = a× h.

5. trapezoidal area = (upper bottom+lower bottom) × height ÷2 Formula S=(a+b)h÷2.

6. Sum of internal angles: sum of internal angles of triangle = 180 degrees.

7. cuboid volume = length× width× height formula: V=abh.

8. cuboid (or cube) volume = bottom area × height formula: V=abh.

9. Volume of cube = side length × side length × side length formula: V=aaa.

10, circumference = diameter× π formula: l = π d = 2π r.

1 1, area of circle = radius× radius× π formula: s = π r? .