D 及 E 為 AC 及 AB 的中點。若 ∠ACB = 27°,求 ∠ADE。

3A04 四邊形 (4.3-4.6) (Q)

Quiz
•
Mathematics
•
8th Grade
•
Easy
YT Tsang
Used 9+ times
FREE Resource
17 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
27°
13.5°
18°
54°
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
D 及 E 為 AC 及 AB 的中點。若 ∠ACB = 72°,求 ∠ADE。
72°
36°
82°
62°
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
D 及 E 分別為 AC 及 BC 的中點。若 DE = 4,求 AB。
2
4
6
8
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
D 及 E 分別為 AC 及 BC 的中點。若 AB = 20,求 DE。
5
10
20
40
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
D 為 AC 的中點,且 DE // AB。若 BE = 6,求 CE。
3
6
12
2
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
D 為 AC 的中點,且 DE // CB。若 AE = 12,求 BE。
18
6
12
24
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
D 及 E 為 AC 及 AB 的中點。若 ∠ACB = 60° 及 ∠AED = 50°,求 ∠BAC。
50°
60°
70°
80°
Answer explanation
BC // ED (中點定理)
∠ADE = 60° (同位角, BC//ED)
在 ∆ ADE,
∠BAC + ∠ADE + ∠AED = 180° ( ∆ 内角和)
∠BAC + 60° + 50° = 180°
∠BAC = 70°
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