YOUR NEXT DISCOVERY

Plane Figures in Geometry

Cut, match and measure flat shapes. Work out how much space they cover.

3 Units10 MissionsAbout 70 minutesCourse map

Complete the Course to Earn a Certificate and Join the Hall of Fame

Three flat pieces on a dotted cutting mat: a right triangle, a tilted four-sided tile and a smaller triangle.
•••Report a problem (opens in a new tab)
An L-shaped floor beside a trapezoid divided into two triangles on a drafting mat.

A CLOSER LOOK

Cover a surface

Measure a real surface and pay for the right amount of material.

See it. Try it. Make it yours.

  1. Cover a surface

  2. Make a triangle

  3. Design a floor

Grade 6 beginners who can count, multiply and divide. · What to know before you start

Bring with you: Count small groups and multiply, divide, add and subtract whole numbers. Read lengths in centimetres (cm) and metres (m).

Measure a real surface and pay for the right amount of material.

Choose and justify perpendicular measurements, rearrange figures, recover missing lengths and check a floor estimate.

By the end, you can…

  • Measure rectangles and parallelograms, then recover a missing length.
  • Choose a base and its height, halve a rectangle or parallelogram, and find a missing length.
  • Split or complete a flat figure and check a real materials estimate.

For another Course

  • Coordinate geometry, volume, surface area and circle measures.

YOUR LEARNING PATH

One idea leads to the next.

0 of 10 Missions completed or proven
Unit 1

Cover a surface

Measure rectangles and parallelograms, then recover a missing length.

  1. Cover the floorMission 1 of 10Locked. Measure the space inside a flat shape with equal squares.
  2. Find the straight gapMission 2 of 10Locked. Pair a base with a height that meets it at a square corner.
  3. Slide a cornerMission 3 of 10Locked. Explain why base times height gives the area of a parallelogram.
  4. Find the missing lengthMission 4 of 10Locked. Work backward from the area of a parallelogram to its base or height.
Unit 2

Make a triangle

Choose a base and its height, halve a rectangle or parallelogram, and find a missing length.

  1. Cut a rectangle in halfMission 5 of 10Locked. Find the area of a right triangle by completing its rectangle.
  2. Turn a second triangleMission 6 of 10Locked. Measure a triangle even when its height falls outside it.
  3. Uncover a hidden measureMission 7 of 10Locked. Use twice a triangle’s area to recover its base or height.
Unit 3

Design a floor

Split or complete a flat figure and check a real materials estimate.

  1. Split a four-sided patchMission 8 of 10Locked. Find a trapezoid’s area by splitting it into known pieces.
  2. Fill the missing cornerMission 9 of 10Locked. Choose between adding pieces and subtracting an empty part.
  3. Price the studio floorMission 10 of 10Locked. Choose and check an area plan, then use it to price floor covering.Mastery Challenge

A Debsie Course · Grade 6 beginners who can count, multiply and divide.