绗?/p>
2
璇炬椂
鍦嗛敟鐨勪晶闈㈢Н鍜屽叏闈㈢Н
涓�銆佽鍓嶉涔?/p>
(5
鍒嗛挓璁粌
)
1.
鍦嗛敟鐨勫簳闈㈢Н涓?/p>
25蟺
锛屾瘝绾块暱涓?/p>
13 cm
锛岃繖涓渾閿ョ殑搴曢潰鍦嗙殑鍗婂緞涓?/p>
________ cm
锛岄珮涓?/p>
________
cm
锛屼晶闈㈢Н涓?/p>
________ cm
2
.
2.
鍦嗛敟鐨勮酱鎴潰鏄竴涓竟闀夸负
10
cm
鐨勬涓夎褰紝鍒欒繖涓渾閿ョ殑渚ч潰绉负
________
cm
2
锛岄敟瑙掍负
_________
锛岄珮涓?/p>
________ cm.
3.
宸茬煡
Rt
鈻?/p>
ABC
鐨勪袱鐩磋杈?/p>
AC=5
cm
锛?/p>
BC=12
cm
锛屽垯浠?/p>
BC
涓鸿酱鏃嬭浆鎵�寰楃殑鍦嗛敟鐨勪晶闈㈢Н涓?/p>
_________ cm
2
锛岃繖涓渾閿ョ殑渚ч潰灞曞紑鍥剧殑寮ч暱涓?/p>
_________ cm
锛岄潰绉负
_________ cm
2
.
4.
濡傚浘
24-4-2-1
锛屽凡鐭ュ渾閿ョ殑搴曢潰鐩村緞涓?/p>
4
锛屾瘝绾块暱涓?/p>
6
锛屽垯瀹冪殑鍏ㄩ潰绉负
__________.
鍥?/p>
24-4-2-1
鍥?/p>
24-4-2-2
浜屻�佽涓己鍖?/p>
(10
鍒嗛挓璁粌
)
1.
绮粨鐨勯《閮ㄦ槸鍦嗛敟褰紝杩欎釜鍦嗛敟鐨勫簳闈㈢洿寰勬槸
4
m
锛屾瘝绾块暱涓?/p>
3
m
锛屼负闃查洦闇�鍦ㄧ伯浠撶殑椤堕儴閾轰笂
娌规锛岄偅涔堣繖鍧楁补姣＄殑闈㈢Н鑷冲皯涓?/p>
(
)
A.6 m
2
B
.6蟺
m
2
C.12 m
2
D
.12蟺
m
2
2.
鑻ュ渾閿ョ殑渚ч潰灞曞紑鍥炬槸涓�涓崐寰勪负
a
鐨勫崐鍦嗭紝鍒欏渾閿ョ殑楂樹负
(
)
A.a
B.
3
3
a
C.3a
D.
2
3
a
3.
鐢ㄤ竴寮犲崐寰勪负
9 cm
銆佸渾蹇冭涓?/p>
120掳
鐨勬墖褰㈢焊鐗囷紝鍋氭垚涓�涓渾閿ュ舰鍐版穱娣嬬殑渚ч潰
(
涓嶈鎺ョ紳
)
锛岄偅涔?/p>
杩欎釜鍦嗛敟褰㈠啺娣囨穻鐨勫簳闈㈠崐寰勬槸
_________ cm.
4.
濡傚浘
24-4-2-2
锛屽凡鐭ュ渾閿ョ殑姣嶇嚎闀?/p>
OA=8
锛屽湴闈㈠渾鐨勫崐寰?/p>
r=2.
鑻ヤ竴鍙皬铏粠
A
鐐瑰嚭鍙戯紝缁曞渾閿ョ殑
渚ч潰鐖涓�鍛ㄥ悗鍙堝洖鍒?/p>
A
鐐癸紝鍒欏皬铏埇琛岀殑鏈�鐭矾绾跨殑闀挎槸
______(
缁撴灉淇濈暀鏍瑰紡
).
5.
涓�涓渾閿ョ殑楂樹负
3
3
cm
锛屼晶闈㈠睍寮�鍥炬槸鍗婂渾锛?/p>
姹傦細
(1)
鍦嗛敟姣嶇嚎涓庡簳闈㈠崐寰勭殑姣旓紱
(2)
閿ヨ鐨勫ぇ灏忥紱
(3)
鍦嗛敟鐨勫叏闈㈢Н
.
涓夈�佽鍚庡珐鍥?/p>
(30
鍒嗛挓璁粌
)
1.
宸茬煡鍦嗛敟鐨勬瘝绾夸笌楂樼殑澶硅涓?/p>
30掳
锛屾瘝绾块暱涓?/p>
4 cm
锛屽垯瀹冪殑渚ч潰绉负
_________ cm
2
(
缁撴灉淇濈暀
蟺).
2.
濡傚浘
24-4-2-3
锛屾湁涓�鍦嗛敟褰㈢伯鍫嗭紝鍏朵富瑙嗗浘鏄竟闀夸负
6 m
鐨勬涓夎褰?/p>
ABC
锛屾瘝绾?/p>
AC
鐨勪腑鐐?/p>
P
澶?/p>
鏈変竴鑰侀紶姝ｅ湪鍋峰悆绮锛屽皬鐚粠
B
澶勬部鍦嗛敟琛ㄩ潰鍘诲伔琚�侀紶锛屽垯灏忕尗缁忚繃鐨勬渶鐭矾绋嬫槸
___________ m.(
缁撴灉涓嶅彇杩戜技鏁?/p>
)