Dung Hinh Bang Thuoc Va Com Pa 8

  • June 2020
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Bµi 1: §iÒn néi dung thÝch hîp vµo chç (…) cho c¸c c©u sau:

hai c¹nh ®èi song song. 1. H×nh thang lµ tø gi¸c cã ……………………………… bï nhau 2. Hai gãc kÒ mét c¹nh bªn cña h×nh thang th× ……… 3. Víi th­íc th¼ng vµ compa dùnggãc ®­îc tam gi¸c nÕu xen ba c¹nh gi÷a biÕt…………. hoÆc biÕt hai c¹nh vµ ……………… hoÆc hai gãc kÒ biÕt mét c¹nh vµ……………

↵ ↵ ↵

2 cm 3 cm

700

4 cm

3

A

B

2 D

4

C

Bµi 2: §iÒn néi dung thÝch hîp vµo chç (…) cho c¸c c©u sau: 1. Víi th­íc, ta cã thÓ: - VÏ ®­îc mét ®­êng th¼ng khi biÕt hai ………… cña nã. - VÏ ®­îc mét ®o¹n ……………..khi biÕt ®iÓm hai ®Çu mót cña nã. th¼ng mét - VÏ ®­îc mét tia khi biÕtgèc …. …vµ ………..… cña tia. ®iÓm ®­êng 2. Víi compa, ta cã thÓ vÏ ®­îcmét ……………………khi biÕt trßn t© b¸n …… vµ …………. cña nã. m kÝnh

↵ ↵ ↵ ↵

0 µ Bµi 3: Dùng ∆ ADC, biÕt AD = 2cm, , DC = 4cm. D=70

2 cm 3 cm 4 cm



70 0

• • A•

••

700



4 d

C

B

0 µ Bµi 3: Dùng ∆ ADC, biÕt AD = 2cm, , DC = 4cm. D=70

2 cm 3 cm 4 cm

70 0

d

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