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专项训练06常考解直角三角形模型2025年中考数学一轮专题复习强化练习(含答案)_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料

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专项训练06常考解直角三角形模型2025年中考数学一轮专题复习强化练习(含答案)_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料
专项训练06常考解直角三角形模型2025年中考数学一轮专题复习强化练习(含答案)_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料
专项训练06常考解直角三角形模型2025年中考数学一轮专题复习强化练习(含答案)_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料
专项训练06常考解直角三角形模型2025年中考数学一轮专题复习强化练习(含答案)_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料
专项训练06常考解直角三角形模型2025年中考数学一轮专题复习强化练习(含答案)_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料
专项训练06常考解直角三角形模型2025年中考数学一轮专题复习强化练习(含答案)_02中考总复习(2026版更新中)_02-数学-中考总复习_2025中考复习资料

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关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 专项训练六 常考解直角三角形模型 1.(2023·日照)日照灯塔是日照海滨港口城市的标志性建筑之一,主要为日照近海及进出日照港的 船舶提供导航服务.数学小组的同学要测量灯塔的高度,如图所示,在点B处测得灯塔最高点A的 仰角∠ABD=45°,再沿BD方向前进至C处测得最高点A的仰角∠ACD=60°,BC=15.3 m,则灯塔的 高度AD大约是(结果精确到1 m,参考数据:√2≈1.41,√3≈1.73)( ) A.31 m B.36 m C.42 m D.53 m 2.林老师打算从学校图书馆的顶楼拉出一条彩旗绳 AB到地面,如图所示.已知彩旗绳与地面形成 25°角(即∠BAC=25°),彩旗绳固定在地面的位置与图书馆相距32 m(即AC=32 m),则彩旗绳AB的 长度为 ( ) A.32sin 25° m B.32cos 25° m 32 32 C. m D. m sin25° cos25° 3.(2023·广西)如图,焊接一个钢架,包括底角为37° 的等腰三角形外框和3 m高的支柱,则共需钢材 约 m.(结果取整数,参考数据:sin 37°≈0.60,cos 37°≈0.80,tan 37°≈0.75) 4.(2023·内江)在△ABC中,∠A,∠B,∠C的对边分别为a,b,c,且满足a2+|c-10|+√b-8=12a-36,则sin B的值为 . 5.(2024·宿迁)双塔是古黄河宿迁景观带的标志性建筑之一,由九层的九龙塔和七层的七凤塔构成. 1关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 某校数学实践小组开展测量七凤塔高度的实践活动,该小组制定了测量方案,在实地测量后撰写 活动报告,报告部分内容如表: 测量七凤塔高度 测角仪、 测量工具 活动形式 以小组为单位 皮尺等 测量示意图 测量步骤及结果 如图,步骤如下: ①在C处使用测角仪测得塔的顶部点B的仰角∠BDG=37°; ②沿着CA方向走到E处,用皮尺测得CE=24米; ③在E处使用测角仪测得塔的顶部点B的仰角∠BFG=45°. …… 已知测角仪的高度为1.2米,点C,E,A在同一水平直线上.根据以上信息,求塔AB的高度. (参考数据:sin 37°≈0.60,cos 37°≈0.80,tan 37°≈0.75) 6.(2024·河北三模)如图,在一个建筑物两侧搭两个长度相同的滑梯(即BC=EF),设计要求左、右两 边的滑梯BC,EF的坡度分别为1∶2和1∶0.5.测得AD=3米,CD=5米. (1)求滑梯的长. (2)试猜想两个滑梯BC,EF的位置关系,并证明. (3)小亮(看成点P)从点E沿滑梯EF下滑,请直接写出他与C处距离的最小值. 2关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 (2024·秦皇岛北戴河区一模)四边形不具有稳定性,工程上可利用这一性质解决问题. 如图是某篮球架的侧面示意图,BE,CD,GF为长度固定的支架,支架在A,D,G处与立柱AH连接 (AH⊥MN),在B,C处与篮板连接(BC⊥MN),EF是可以调节长度的伸缩臂(旋转点F处的螺栓改变 EF的长度,使得支架BE绕点A旋转,从而改变四边形ABCD的形状,以此调节篮板的高度).已知 AD=BC,DH=208 cm;测得∠GAE=60°时,点C离地面的高度为288 cm.调节伸缩臂EF,使得点C离 地面的高度升高 16 cm,判断∠GAE 增大还是减小了?增大(或减小)了多少度?(参考数据:sin 54°≈0.8,cos 54°≈0.6) 3关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 【详解答案】 基础夯实 1.B 解析:在 Rt△ADB 中,∠ABD=45°,∴AD=BD.设 AD=x m,则 BD=x m,CD=(x-15.3)m.在 Rt△ADC 中, AD x ∠ACD=60°,∴tan∠ACD= = =√3,∴x≈36,∴灯塔的高度AD大约是36 m.故选B. CD x-15.3 2.D 解析:∵AC表示的是地面,BC表示的是图书馆,∴AC⊥BC. AC 32 ∴△ABC为直角三角形.∴AB= = m.故选D. cos25° cos25° 3.21 解析:∵△ABC是等腰三角形,且CD⊥AB,∴AD=BD. CD 3 CD 3 ∵CD=3 m,∴AC=BC= ≈ =5(m),AD=BD= ≈ =4(m). sin37° 0.60 tan37° 0.75 ∴共需钢材约为2AC+2AD+CD=21 m. 4 4. 解 析 :∵ a2+|c-10|+√b-8=12a-36,∴ a2-12a+36+|c-10|+√b-8=0.∴ (a-6)2+|c-10|+√b-8 5 b 8 4 =0.∴a-6=0,c-10=0,b-8=0.解得a=6,b=8,c=10.∴a2+b2=62+82=100=102=c2.∴∠C=90°.∴sin B= = = . c 10 5 5.解:由题意得,DF=CE=24米,AG=EF=CD=1.2米,∠BDG=37°,∠BFG=45°, BG 在Rt△BDG中,tan∠BDG=tan 37°= ≈0.75, DG BG ∴GD= , 0.75 在Rt△BFG中,∵∠BFG=45°, ∴FG=BG, ∵DF=24米, BG ∴DG-FG= -BG=24, 0.75 解得BG=72, ∴AB=72+1.2=73.2(米), ∴塔AB的高度为73.2米. 6.解:(1)在Rt△ACD中, ∵AD=3米,CD=5米, ∴AC= =4(米), √CD2-AD2=√52-32 ∵滑梯BC的坡度分别为1∶2, 4关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 ∴AB=2AC=8(米), 在Rt△ABC中, BC= =4 (米), √AB2+AC2=√82+42 √5 ∴滑梯的长为4√5米. (2)两个滑梯BC,EF的位置关系:BC⊥EF. 证明:延长BC交EF于点G,如图1, 图1 ∵左、右两边的滑梯BC,EF的坡度分别为1∶2和1∶0.5, AC 1 DE 1 2 ∴ = , = = , AB 2 DF 0.5 1 ∴AB=2AC,DE=2DF, ∵BC=EF,BC2=AB2+AC2=5AC2,EF2=DE2+DF2=5DF2, ∴AC=DF, 又∵∠BAC=∠EDF=90°, ∴Rt△ABC≌Rt△DEF(HL), ∴∠ABC=∠DEF, ∵∠DFE+∠DEF=90°, ∴∠DFE+∠ABC=90°, ∴∠BGF=90°, ∴BC⊥EF. (3)他与C处距离的最小值为2√5米. 解析:理由:小亮(看成点P)从点E沿滑梯EF下滑,他与C处距离的最小值就是CG的长. 延长BC交EF于点G,连接BE,如图2, 图2 由(1)(2)知AB=DE=8米,AC=DF=4米,BC=EF=4√5米, ∴BF=AB+AD+DF=8+3+4=15(米), 5关注公众号:陆陆高分冲刺 ~领取:最新版“小中高考-总复习”、最新试卷下载 1 1 ∵S = EF·BG= BF·DE, △BEF 2 2 BF·DE 15×8 ∴BG= = =6√5(米), EF 4√5 ∴CG=BG-BC=6√5-4√5=2√5(米), ∴他与C处距离的最小值为2√5米. 能力提升 解:∠GAE减小,减小6°. 理由:如图,当∠GAE=60°时,延长BC与底面交于点K,过D作DQ⊥CK于点Q, ∵BC⊥MN,AH⊥MN, ∴BC∥AH, ∵AD=BC, ∴四边形ABCD是平行四边形, ∴AB∥CD, ∴∠QCD=∠ADC=∠GAE=60°, ∵点C离地面的高度为288 cm,DH=208 cm, ∴CQ=288-208=80(cm). CQ 80 = 在Rt△CDQ中,CD=cos60° 1 =160(cm). 2 如图,点C离地面的高度升高16 cm时, ∴CQ=80+16=96(cm). CQ 96 ∴cos ∠QCD= = =0.6. CD 160 ∴∠QCD≈54°. ∴此时∠GAE=∠ADC=∠QCD=54°. ∵60°-54°=6°, ∴∠GAE减小了,减小了6°. 6
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  1. CONNECT:[ UseTime:0.001225s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001740s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000689s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000661s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001381s ]
  6. SELECT * FROM `set` [ RunTime:0.000539s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001600s ]
  8. SELECT * FROM `wendang` WHERE `id` = 331325 LIMIT 1 [ RunTime:0.001253s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 331325 [ RunTime:0.002912s ]
  10. UPDATE `wendang` SET `lasttime` = 1772498391 WHERE `id` = 331325 [ RunTime:0.000583s ]
  11. SELECT * FROM `wendang` WHERE `id` < 331325 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000478s ]
  12. SELECT * FROM `wendang` WHERE `id` > 331325 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002079s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 331325 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013011s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 331325 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011538s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 331325 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001401s ]
0.198014s