1 area of parallelogram = base × height

Trapezoidal area = (upper bottom+lower bottom) × height ÷2

Diameter =2 r

Circumference =πd= 2πr

Area of circle = πr^2

Surface area of cuboid =

(length× width+length× height+width× height) ×2

Cuboid volume = length × width × height

Surface area of cube = side length × side length ×6

Volume of cube = side length × side length × side length

Lateral area of cylinder = perimeter of bottom circle × height.

Surface area of cylinder = upper and lower bottom areas+side area.

Volume of cylinder = bottom area × height

Volume of cone = bottom area × height ÷3

Cylinder volume = bottom area × height

plane graph

Name symbol perimeter c and area s

The length of side a of a square is c = 4as = a2.

The length of a side and b side of a rectangle C = 2 (A+B) S = AB.

2 1 There is only one straight line at two points.

The line segment between two points is the shortest.

The complementary angles of the same angle or equal angle are equal.

The complementary angles of the same angle or the same angle are equal.

One and only one straight line is perpendicular to the known straight line.

Of all the line segments connecting a point outside the straight line with points on the straight line, the vertical line segment is the shortest.

7 Parallel axiom passes through a point outside a straight line, and there is only one straight line parallel to this straight line.

If both lines are parallel to the third line, the two lines are also parallel to each other.

The same angle is equal and two straight lines are parallel.

The internal dislocation angles of 10 are equal, and the two straight lines are parallel.

1 1 are complementary and two straight lines are parallel.

12 Two straight lines are parallel and have the same angle.

13 two straight lines are parallel, and the internal dislocation angles are equal.

14 Two straight lines are parallel and complementary.

Theorem 15 The sum of two sides of a triangle is greater than the third side.

16 infers that the difference between two sides of a triangle is smaller than the third side.

The sum of the internal angles of 17 triangle is equal to 180.

18 infers that the two acute angles of 1 right triangle are complementary.

19 Inference 2 An outer angle of a triangle is equal to the sum of two non-adjacent inner angles.

Inference 3 The outer angle of a triangle is greater than any inner angle that is not adjacent to it.

2 1 congruent triangles has equal sides and angles.

Axiom of Angular (sas) has two triangles with equal angles.

The Axiom of 23 Angles (asa) has the congruence of two triangles, which have two angles and their sides correspond to each other.

The inference (aas) has two angles, and the opposite side of one angle corresponds to the congruence of two triangles.

The axiom of 25 sides (sss) has two triangles with equal sides.

Axiom of hypotenuse and right angle (hl) Two right angle triangles with hypotenuse and right angle are congruent.

Theorem 1 The distance between a point on the bisector of an angle and both sides of the angle is equal.

Theorem 2 is a point with equal distance on both sides of an angle, which is on the bisector of this angle.