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直角，第一感觉和直线类似，按理说应该是180°，现在怎么成了90°了？

1 英语原意

直角三角形 Right triangle

2 Right 英文原意

2.1 right adjective

1: RIGHTEOUS, UPRIGHT

2: being in accordance with what is just, good, or proper

right conduct

3: conforming to facts or truth : CORRECT

the right answer

4: SUITABLE, APPROPRIATE

the right man for the job

5: STRAIGHT

a right line

6: GENUINE, REAL

7 a: of, relating to, situated on, or being the side of the body which is away from the side on which the heart is mostly located

b: located nearer to the right hand than to the left

c: located to the right of an observer facing the object specified or directed as the right arm would point when raised out to the side

d(1): located on the right of an observer facing in the same direction as the object specified

stage right

(2): located on the right when facing downstream

the right bank of a river

e: done with the right hand

a right hook to the jaw

8: having the axis perpendicular to the base

right cone

9: of, relating to, or constituting the principal or more prominent side of an object

made sure the socks were right side out

10: acting or judging in accordance with truth or fact

time proved her right

11 a: being in good physical or mental health or order

not in his right mind

b: being in a correct or proper state

put things right

12: most favorable or desired : PREFERABLE

also : socially acceptable

knew all the right people

13 often capitalized : of, adhering to, or constituted by the Right especially in politics

2.2 right noun

1: qualities (such as adherence to duty or obedience to lawful authority) that together constitute the ideal of moral propriety or merit moral approval

2: something to which one has a just claim: such as

a: the power or privilege to which one is justly entitled

voting rights

his right to decide

b(1): the interest that one has in a piece of property —often used in plural

mineral rights

(2)rights plural : the property interest possessed under law or custom and agreement in an intangible thing especially of a literary and artistic nature

film rights of the novel

3: something that one may properly claim as due

knowing the truth is her right

4: the cause of truth or justice

5 a: RIGHT HAND sense 1a

also : a blow struck with this hand

gave him a hard right on the jaw

b: the location or direction of the right side

woods on his right

c: the part on the right side

d: RIGHT FIELD

e: a turn to the right

take a right at the stop sign

6 a: the true account or correct interpretation

b: the quality or state of being factually correct

7 often capitalized

a: the part of a legislative chamber located to the right of the presiding officer

b: the members of a continental European legislative body occupying the right as a result of holding more conservative political views than other members

8 a often capitalized : individuals professing support of the established order and favoring traditional attitudes and practices and conservative governmental policies

b often capitalized : a conservative position

9 a: a privilege given stockholders to subscribe pro rata to a new issue of securities generally below market price

b: the negotiable certificate evidencing such privilege —usually used in plural

2.3 right adverb

1: according to right

live right

2: in the exact location, position, or moment : PRECISELY

right at his fingertips

quit right then and there

3: in a suitable, proper, or desired manner

knew he wasn't doing it right

4: in a direct line, course, or manner : DIRECTLY, STRAIGHT

go right home

came right out and said it

5: according to fact or truth : TRULY

guessed right

6 a: all the way

windows right to the floor

b: in a complete manner

felt right at home

7: without delay : IMMEDIATELY

right after lunch

8: to a great degree : VERY

a right pleasant day

9: on or to the right

looked left and right

2.4 right verb

righted; righting; rights

transitive verb

1 a: to do justice to : redress the injuries of

so just is God to right the innocent

—William Shakespeare

b: JUSTIFY, VINDICATE

felt the need to right himself in court

2: AVENGE

vows to right the injustice done to his family

3 a: to adjust or restore to the proper state or condition

right the economy

b: to bring or restore to an upright position

right a capsized boat

3 Right中文翻译

n.右；正确；权利；右边

adv.马上；正常；正好；顺利

adj.恰当；正常；正当；妥当

v.纠正；改正；使回到正常位置；把…扶正

int.好的；喂；（要确保对方同意或明白时说）对不

网络 正确的；对的；右对齐

4 心得体会

Right这个单词都认识，Left Right，Right Wrong，左和右，对和错，其实除了这两个意思之外，还有好多意思，Right在Right triangle这个词组里的意思就是“直的”意思。

《几何原本》中对“直角”的定义：当一条直线和另一条横的直线交成的邻角彼此相等时，这些角的每一个被叫做直角，而且称这一条直线垂直于另一条直线。角度比直角小的称为锐角，比直角大而比平角小的称为钝角。

直角第一感觉是180°，但是古代的学者将其定义成了90°，就像以前的通假字一样，​将错就错吧。