Chapter IUnvarying of Figure plan and their

uses in solving problem

A. Figures that are unvarying and congruent

1. Scaled photo

Example of unvarying which always we find everyday is scaled photo, such as the picture.

2. Definition of unvarying

Definition of unvarying involve generally for all figure plan. Two figure plans are unvarying if they include the following requirements.a. The length of sides that is fitted of the two figures has

valued comparison.b. The angles that are fitted of two figures are same.

3. Definition of congruent

By the explanation, we can conclude;a. The sides that are fitted on a rectangle abcd and

rectangle befc are same andb. The angles that are fitted on a rectangle abcd and

rectangle befc are same.

Figures that have same shape and size are called congruent shape.

B. Unvarying triangle

1. Requirements of unvarying triangle

Requirements of unvarying triangle:Two triangles are unvarying if the sides that are unvaried has fitted same angle.

2. Comparison of equation part on triangle

1) SQT = PQR (berimpit)2) TSQ = RPQ (sehadap)3) STQ = PRQ (sehadap)

SQT is unvarying with PQR

C. Two triangles that are congruent

1. Characteristics of two triangles that are congruent

Two triangles that are congruent have the following character:The sides that are fitted and same length.

The angles that are fitted and same size.

2. Requirements of two congruent triangle

a. The fitted size has same length.b. Two sides that are fitted has same length and the angle

have same wedgedc. Two angles that are fitted, same size and sides which has

same length.d. Two angles that are fitted , same size, side that located in

it front of are same length

3. The length of line, and the size of angle by the geometric figure

Character 1 and character 2 ofIsosceles triangle of 30° are:

Character 1The length of weight length of isosceles triangle with the angle is 30° drown from angle point of isosceles with a half of hypotenuse.

Character 2The length of the short length of isosceles triangle that the angle is 30° equal to the length of a half hypotenuse.