Space · Challenge 20 of 25 · about 7 min

Mirror and Turn

Reflect grid cells across a vertical mirror line, then test a half-turn.

Year 4 challenge progress 0 of 25 complete

1 Read

Your challenge

Complete the right half of a 4 × 4 grid so the filled pattern has vertical line symmetry. The mirror line is between columns 2 and 3; the filled left cells are r1c1, r2c2, r3c2 and r4c1. After completing it, will the pattern match itself after a half-turn?

Take your time. Your answer is checked only when you choose Check Answer.

Curriculum details

Curriculum code: VC2M4SP04
Strand: Space
Focus: Recognise line symmetry and rotational symmetry.

An interactive Same distance, opposite side model is ready. Choose Show Visual Trick to reveal and hear one mathematical change at a time.

6 Solve

Your answer

Mirrored cells

Select only the cells that complete the reflected right half.

Will it match after a half-turn?

Yes No

JavaScript is required for the interactive visual and instant answer checking.

Text equivalent: Four cells on the left of a four-by-four grid reflect to four cells at equal distances on the right. Rotating the completed pattern by half a turn makes it match itself.

Mirror and Turn

Your challenge

Interactive visual

Same distance, opposite side

Your answer

Why the answer makes sense