**Các từ vựng về độ đo các góc**

**plane:** Phẳng

**geometry**: Hình học

**plane** **geometry**: Hình học
phẳng

**point**: Điểm

**line**: Đường thẳng

**ray:** Tia, vector

**length**: Chiều dài

**straight**: Thẳng; **straight angle:** Góc bẹt

**curved**: Cong

**segment**: Đoạn.

**distance**: Khoảng cách

**angle**: Góc

**degree**: Độ

**side**: Cạnh

**parallel**: Song song

**crossed**: Cắt, cắt bởi

**transversal**: Đường ngang, đường hoành

**diagram**: Hình vẽ, hình minh họa

**circle**: Đường tròn, hình tròn

**half**: Một nửa

**a** **half** **circle**: Nửa đường tròn

**greater** **than**: Lớn hơn

**less** **than**: Nhỏ hơn

**equal**, **equal** **to**: Bằng, bằng nhau

**intersect**: Giao

**union**: Hợp, hội

**measure**: Số đo

**classified**: Phân loại

*Một số từ kết hợp với từ khác hoặc có tên gọi trong lĩnh vực toán học*

**acute**: Nhọn

**right**: Vuông.

**obtuse**: Tù

**reflex**: Phản.

**complementary**: Bù, bù nhau.

**supplementary**: Phụ, phụ nhau.

**vertical**: Đỉnh.

CÁC BÀI VIẾT CÙNG CHUYÊN MỤC

- Calculating with triangles
- The name of all triangles
- Properties of triangles – Part 1
- Properties of triangles – Part 2
- Angles Practice 1
- Vocabulary of Fractions
- Vocabulary of Shapes

**Angles***.*An angle is formed when two lines intersect at a point.

Angle B,

Angle ABC,

∠B, and ∠ABC are all possible names for the angle shown.

- The measure of the angle is given in degrees.
- If the sides of the angle form a straight line, then the angle is said to be a straight angle and has 180°.
- A circle has 360°, and a straight angle is a turning through a half circle.
- All other angles are either greater or less than 180°.

**Angles are classified in different ways:**

- An
has less than 90°.*acute*angle

- A
*right***angle**has exactly 90°.

- An
*obtuse***angle**has between 90° and 180°.

- A
has exactly 180°.*straight*angle

- A
has between 180° and 360°.*reflex*angle

*Complementar**y***angles**. Two angles areif their sum is 90°.*complementar**y*

For example, an angle of **49°** and an angle of **41**° are complementary.

*Supplementary*anglesTwo angles are*.*if their sum is*supplementary***180**°. If one angle is**120°**, then its supplement is**60°.**

*Vertical angles**(các góc đối đỉnh)*. These are pairs of opposite angles formed by the intersection of two straight lines. Vertical angles are always equal to each other.

**Example: **In the
diagram shown, angles *AEC *and *BED *are equal because they are vertical
angles. For the same reason, angles *AED *and *BEC *are equal.

When two parallel lines are crossed by a third straight line (called a *transversal*), then all the acute angles formed are equal, and all of the obtuse angles are equal.

**Example:**

In the diagram below, angles 1, 4, 5, and 8 are all equal. Angles 2, 3, 6, and 7 are also equal.

——End of Vocabulary Angles———-