1, squared:

Perimeter = side length × 4c = 4a;

Area = side length × side length s = a× a.

2. Cube:

Surface area = side length × side length× ×6 S table = a× a× 6;

Volume = side length × side length × side length v = a× a× a.

3. Rectangular:

Perimeter = (length+width) × 2c = 2 (a+b);

Area = length × width S=ab.

4. Cuboid:

Surface area (length× width+length× height+width× height )× 2s = 2 (AB+AH+BH);

Volume = length× width× height V=abh.

The Important Theorem of Junior One Mathematics

1. The bisector of the vertex of the isosceles triangle bisects the base and is perpendicular to the base.

2. The bisector of the top angle, the median line on the bottom edge and the height on the bottom edge of the isosceles triangle coincide with each other.

3. All angles of an equilateral triangle are equal, and each angle is equal to 60.

4. Judgment Theorem of an isosceles triangle If the two angles of the triangle are equal, then the opposite sides of the two angles are also equal (equilateral).

A triangle with three equal angles is an equilateral triangle.

6. An isosceles triangle with an angle equal to 60 is an equilateral triangle.

7. In a right triangle, if an acute angle is equal to 30, the right side it faces is equal to half of the hypotenuse.

8. The midline of the hypotenuse of a right triangle is equal to half of the hypotenuse.