Skip to the content
Peabody TeachFor teachers and grown-ups

Area of triangles and nets: 6th grade math

Area of triangles, quadrilaterals, polygons; surface area from nets; volume with fractional edges. A free 6th grade lesson plan, a question set with answers and a printable sheet with its key. Copy it and make it yours.

Lesson plan

Goal

  • Students can do this: area of triangles, quadrilaterals, polygons; surface area from nets; volume with fractional edges.

Teach (10 min)

  • Cut a triangle off one side of a parallelogram and slide it to the other side: it becomes a rectangle.
  • So area = base × height. The height is straight up, at a right angle to the base, not along the slanted side.
  • Work one example on the board while students say each step aloud, then do one together.

Practise (15 min)

  • Students work the printable sheet in pairs, then alone.
  • Or practise it as a game with no sign-up: https://peabody.kids/math/solids.para?lesson=6-solids-para-1&at=6

Exit ticket (5 min)

  • Use the first three questions on the printable sheet as a slip.

Printable sheet

Name: ____________________   Date: ____________

Area of triangles and nets (6th grade)

  1. What is the area of this parallelogram?
    6 in4 in5 in
  2. What is the area of this parallelogram?
    9 ft3 ft5 ft
  3. What is the area of this parallelogram?
    13 ft6 ft10 ft
  4. What is the area of this parallelogram?
    6 m4 m5 m
  5. What is the area of this parallelogram?
    7 cm8 cm10 cm
  6. What is the area of this parallelogram?
    11 in8 in10 in
  7. What is the area of this parallelogram?
    12 in6 in10 in
  8. To find the area of this parallelogram, which lengths do you multiply?
    10 m8 m10 m
  9. What is the area of this parallelogram?
    15 cm9 cm15 cm
  10. What is the area of this parallelogram?
    16 cm8 cm17 cm
  11. What is the area of this parallelogram?
    14 m9 m15 m
  12. What is the area of this parallelogram?
    17 ft12 ft20 ft
Key
  1. 24 square in
  2. 27 square ft
  3. 78 square ft
  4. 24 square m
  5. 56 square cm
  6. 88 square in
  7. 72 square in
  8. 10 × 8 (the base and the height)
  9. 135 square cm
  10. 128 square cm
  11. 126 square m
  12. 204 square ft

Written by Peabody from its own skill pages. Free, no ads, no sign-in. Children can practise this on Peabody. More from teachers: teacher-shared resources.