Quadrilaterals (II)
Parallel lines, which never meet and stay the same distance apart; parallelograms, with two pairs of parallel opposite sides, each pair equal in length; why squares and rectangles are parallelograms too; trapeziums, with only one pair of parallel sides, the upper and lower bases; and drawing and making both shapes.
Key words
| Chinese | English |
|---|---|
| 平行線 | parallel lines |
| 平行四邊形 | parallelogram |
| 梯形 | trapezium |
| 上底 | upper base |
| 下底 | lower base |
The 8 short lessons and the chapter test
Lessons are in Chinese for now.
- 平行線
- 平行的對邊
- 平行四邊形
- 正方形和長方形也是平行四邊形
- 梯形
- 圖形的名稱
- 製作四邊形
- 重溫
- 章節測驗 (chapter test)
Sample questions (in Chinese)
Question 1哪一組直線互相平行？
Answer and explanation
答案：C
為甚麼？平行線永不相交，兩線之間的距離處處相等。其他每組直線，延長後都會相交。
Question 2這個四邊形有多少組平行的對邊？
- 0 組
- 1 組
- 2 組
Answer and explanation
答案：A．0 組
為甚麼？這個圖形的兩組對邊延長後都會相交，沒有平行的對邊。
Question 3哪一個是平行四邊形？
Answer and explanation
答案：C
為甚麼？兩組對邊分別平行的四邊形是平行四邊形。正方形的兩組對邊分別平行，所以正方形也是平行四邊形。其他圖形最多只有一組對邊平行。
Question 4下面有多少個平行四邊形？
有 個。
Answer and explanation
答案：有 3 個。
為甚麼？兩組對邊分別平行的都是平行四邊形，正方形和長方形也要數。共有 3 個。
Based on learning unit 3S1 of the Education Bureau’s Primary Mathematics Curriculum (2017).