首页
登录
职称英语
In the circle below, PQ is parallel to diameter OR. OR has length 18. What is th
In the circle below, PQ is parallel to diameter OR. OR has length 18. What is th
游客
2025-02-23
16
管理
问题
In the circle below, PQ is parallel to diameter OR. OR has length 18. What is the length of minor arc PQ?
选项
答案
2π
解析
求与弧相关的数量,如弧长、扇形面积等,需先求出弧所对的圆心角的大小。求角度时,可利用目前已知的角度,通过平行、垂直等条件推出目标所求的角度。圆周角∠R=35°,所以所对的弧OP的角度是35°×2=70°。又因为PQ平行于OR,所以∠P=∠R=35°(内错角),圆周角∠P所对的弧QR的度数是70°。因为OR是直径,所以,弧OR(上半部分)的角度是180°。所以,弧PQ的角度是弧OR-弧OP-弧QR=180°-70°-70°=40°。同时已知OR直径长为18,则半径长为9。代入弧长公式,得弧PQ的弧长l=40×π×9/180=2π。
转载请注明原文地址:https://tihaiku.com/zcyy/3969830.html
相关试题推荐
Ifthelengthofeachsideofanequilateraltrianglewereincreasedby50perce
TheareaofcircleWis16πandtheareaofcircleZis4π.Whatistheratioof
ABCEisasquare,andBCDEisaparallelogram.[img]2022m10s/ct_ve01203002j_egre
SupposeABCDisarectangle,Oisthecenterofthecircle.Ifthecoordinateso
Atrianglehasonesideoflength5andanothersideoflength14.Whatarethe
Inthefigure,Oisthecenterofthecircleandtheareaofthecircleis4π,w
SIGHT:BLUR::A、length:increaseB、destruction:disintegrateC、dilemma:jumbleD、wr
Acleverbitofartistry,insteadoflengtheningthedistancebetweenus______an
DIMINUENDO:SOUND::A、wavelength:voiceB、rarefaction:definitionC、volume:s
SIGHT:BLUR::A、length:increaseB、destruction:disintegrateC、dilemma:jumble
随机试题
PreparingforTestsWhatyouneedtounderst
Normallyastudentmustattendanumberofcoursesinordertograduate,and
Somepsychologistsmaintainthatmentalactssuchasthinkingarenotperfor
[originaltext]M:Howabouttheexaminationlastweek?W:IfI’dgotmoretime,
Inorderto“changelivesforthebetter
现金及银行存款日记账按规定应采用订本式账簿,总分类账和明细分类账既可以用订本账,
一、题目 试述稳步推进利率市场化改革的必要性 二、背景与答题要求 中
(2020年真题)关于公募基金的投资与交易行为的限制,以下说法错误的是(
2012年1-4季度该市人均可支配收入中,增长量最大的是:() A.工资性
一例涎腺切除样本的镜下以腺实质萎缩、间质淋巴细胞浸润和上皮肌上皮岛形成为主要特点
最新回复
(
0
)