Lines and Symmetry — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which shape has exactly 2 lines of symmetry?
A) Equilateral triangle
B) Square
C) Rectangle
D) Regular pentagon
The correct answer is C) Rectangle. Which shape has exactly 2 lines of symmetry — the answer is Rectangle.
2. A transversal is a line that crosses two or more other lines. If it crosses two parallel lines, how many angles does it create in total?
A) 4
B) 6
C) 8
D) 12
The correct answer is C) 8. A transversal is a line that crosses two or more other lines. If it crosses two parallel lines, how many angles does it create in total — the answer is 8.
3. Which of the following has no line of symmetry?
A) Circle
B) Square
C) Parallelogram
D) Isosceles triangle
The correct answer is C) Parallelogram. Which of the following has no line of symmetry — the answer is Parallelogram.
4. If a shape has exactly 8 lines of symmetry, which shape could it be?
A) Regular hexagon
B) Regular octagon
C) Regular pentagon
D) Regular heptagon
The correct answer is B) Regular octagon. If a shape has exactly 8 lines of symmetry, which shape could it be — the answer is Regular octagon.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A line that cuts across two parallel lines is called a transversal.
The answer is transversal. When a line crosses two parallel lines, it is called a transversal because it travels across both lines, creating pairs of angles at each intersection.
2. The letter N has 0 line(s) of symmetry.
The answer is 0. No matter where you draw a line through the letter N, the two halves will never be mirror images of each other, so it has zero lines of symmetry.
3. Two angles that add up to 90° are called complementary angles.
The answer is complementary. Two angles that combine to form a right angle (90°) are called complementary angles, such as a 30° angle paired with a 60° angle.
4. A rhombus has 2 pairs of parallel sides.
The answer is 2. A rhombus has two pairs of parallel sides because opposite sides always run in the same direction and never meet, just like a tilted square.
5. The midpoint of a line segment divides it into two equal parts.
The answer is equal. The midpoint is the exact center of a line segment, so both halves measure the same length.