2023-2024學(xué)年福建省龍巖市上杭三中八年級(jí)（上）開(kāi)學(xué)數(shù)學(xué)試卷（含解析）

2023-2024(±)JiWia

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B.210°ED

C.240°

D.270°

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21.(*/J'?8.05y)

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11.[g^J15

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JI^?tlMUèj^?+6+3=15cm.

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12.1620

(WrlW:(11-2)X180°

=9x180

=1620°.

1620.

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“n'M$M\=(n-2)X180°”

13.[W65°

3cm

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65°;3cm.

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14.40

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M?TH???WH?^??^^"T-JRià-lél5iè?^mHéI<|-￥,BPsA=ixJ?x^;

15.140°

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???Z.AED=Z.A'ED,Z.ADE=ZA'DE,Z.A=Z.A'=70°,

???Z.AED+Z.ADE=Z-A'ED+Z.A'DE=180°-70°=110°,

.-.Z1+Z2=360°-2x110°=140°.

140°.

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17.r<^]?:

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n-2=6-1,

n=7.

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18.[^M]W-:???/-B=44/1,

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4

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4

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20.W:(1)???41+4BCO=90°,41=4B

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(2)vAACB=^CDB=90°

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21.JW:???±CAE=25°,zC=40°,

?■?Z.AEB=/-CAE+zC=25°+40°=65°,

■:Z.CBD=30°,

.-.Z-AFB=/_CBD+Z.AEB=30°+65°=95°.

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w.

22.W-:■??zB=36°,ZC=70°,

.-.Z.BAC=180°-ZB-ZC=74°,

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:■Z.AEB=180°-zB-Z.BAE=107°,

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7Z?BB=Z?BB+^DAE,

:.￡DAE=Z?BB-Z?BB=107°-90°=17°.

[Wlff]SOJffl=?ff^rt?^^fBzB/lC=74°,àiAE^BAC^^,M^BAE^&^l.,

^Wz?BBaW^,nJWtHzO/lBaW^.

23.[^M](1)W:"AE.CFft%m}S-BAD%l￡BCD,?.EAB=32°,

???ZZMB=64°,

7zB=ZB=90°,

.-.ZD4B+ZDCB=180°,

??■zDCB=180°-zD/lB=116°,

AzFCE=|x116°=58°;

(2)M:VzB=zD=90°,

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VAE:'P^/BAD'ZCDf&E,CF^ft/.BCD?C.ABTtiF,

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■■■/BAC+ZF+/ACB=180°,

a+p=180°.

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^?i?.W/ABD=/ACE,f?BD=CE,/B=/ACE=45°,WJzFCE=90°,JWFO1CE-,

(2)?i?BJUCAE^A.BAD,^/.ACE=AB,üüjzF=ZzlCF=AACE,^^/.B+AACB=/.DCE=p,

WézF?C+zF+tACB=180°fê^Hla+P=180°.

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25.[^^1M:(l)z?EFft<J^/b^,

M^PQMffl%.To,

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11

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.-.zF=45°,

AFDC+AFCD=135°,

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???ZCDF+zDCF=112.5°,

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