南一國中數學3上ch3-2 Flashcards: 10 Cards (Grade 9)

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10 questions

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1.

FLASHCARD QUESTION

Front

△ABC中， $\overline{AB}=\overline{AC}$ ，∠B＝40°，O為△ABC的外心，則∠BOC＝？

Back

160°

2.

FLASHCARD QUESTION

Front

△ABC中，∠A：∠B：∠C＝3：4：5。若O是△ABC的外心，則∠AOB＝？

Back

150°

3.

FLASHCARD QUESTION

Front

△ABC中，∠B＝90°。若外心O到三頂點A、B、C的距離和為30公分，則 $\overline{AC}$ 為多少公分？

Back

20

4.

FLASHCARD QUESTION

Front

下列敘述何者正確？

Back

以上皆對

5.

FLASHCARD QUESTION

Front

△ABC中， $\overline{AB}$ ＝13 cm， $\overline{BC}$ ＝5 cm， $\overline{AC}$ ＝12 cm，I 是內心，請問△AIC的面積為多少cm²？

Back

12

6.

FLASHCARD QUESTION

Front

△ABC中，∠A＝90°， $\overline{AB}$ ＝8 m， $\overline{AC}$ ＝6 m。若 I 為△ABC的內心，則△BIC的面積為多少m²？

Back

10

7.

FLASHCARD QUESTION

Front

△ABC的內心在三角形的內部，則△ABC會是何種三角形？

Back

以上都有可能

8.

FLASHCARD QUESTION

Front

△ABC中， $\overline{AB}$ ＝5， $\overline{BC}$ ＝12， $\overline{AC}$ ＝13。若D、E分別是△ABC的重心和外心，則 $\overline{DE}$ ＝？

Back

$\frac{13}{6}$

9.

FLASHCARD QUESTION

Front

△ABC中，若 $\overline{AD}$ 為中線，G為重心，則△GBD面積：△ABC面積＝？

Back

1：6

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