2D Shapes

0.0(0)
Studied by 1 person
call kaiCall Kai
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
GameKnowt Play
Card Sorting

1/10

encourage image

There's no tags or description

Looks like no tags are added yet.

Last updated 2:28 PM on 6/20/26
Name
Mastery
Learn
Test
Matching
Spaced
Call with Kai

No analytics yet

Send a link to your students to track their progress

11 Terms

1
New cards

Parallelograms

  • Angles

    • Opposite angles of a parallelogram are equal

    • The interior angles add up to 360°

    • Reason:

      • (Opp angles of parm are equal)

  • Sides

    • Opposite sides of a parallelogram are parallel and equal

    • Reasons:

      • (Opp sides of parm are equal)

      • (Opp sides of parm are parallel)

  • Diagonals

    • The diagonal lines of a parallelogram bisect each other

    • Reason:

      • (Diags of parm bisect)

<ul><li><p>Angles</p><ul><li><p>Opposite angles of a parallelogram are equal</p></li><li><p>The interior angles add up to 360°</p></li><li><p>Reason:</p><ul><li><p>(Opp angles of parm are equal)</p></li></ul></li></ul></li><li><p>Sides</p><ul><li><p>Opposite sides of a parallelogram are parallel and equal</p></li><li><p>Reasons:</p><ul><li><p>(Opp sides of parm are equal)</p></li><li><p>(Opp sides of parm are parallel)</p></li></ul></li></ul></li><li><p>Diagonals</p><ul><li><p>The diagonal lines of a parallelogram bisect each other</p></li><li><p>Reason:</p><ul><li><p>(Diags of parm bisect)</p></li></ul></li></ul></li></ul><p></p>
2
New cards

Acute-angled Triangle

All three interior angles are smaller than 90°

<p>All three interior angles are smaller than 90°</p>
3
New cards

Obtuse-angled Triangle

  • The largest interior angle is greater than 90°

  • The other two angles are acute

<ul><li><p>The largest interior angle is greater than 90°</p></li><li><p>The other two angles are acute</p></li></ul><p></p>
4
New cards

Right-angled Triangle

  • The largest interior angle is equal to 90°

  • The other two angles are acute

<ul><li><p>The largest interior angle is equal to 90°</p></li><li><p>The other two angles are acute</p></li></ul><p></p>
5
New cards

Pythagoras Therom

  • The Pythagorean theorem states that in a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides

  • c² = a²+b²

    • c is the length of the hypotenuse (the side opposite the right angle)

    • a and b are the lengths of the other two sides

<ul><li><p>The Pythagorean theorem states that in a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides</p></li><li><p>c² = a²+b²</p><ul><li><p>c is the length of the hypotenuse (the side opposite the right angle)</p></li><li><p>a and b are the lengths of the other two sides</p></li></ul></li></ul><p></p>
6
New cards

Scalene triangle

No sides or angles are equal

<p>No sides or angles are equal</p>
7
New cards

Isosceles Triangle

  • Two sides are equal and the angles opposite the equal sides are equal

    • Eg:

      • AB = AC if B1 = C1 (Sides opp equal angles)

      • B1 = C1 if AB = AC (Angles opp equal side)

8
New cards

Equilateral Triangle

Three sides are equal and the interior angles are equal to 60°

9
New cards

Triangles

  • The sum of the interior angles of a triangle is 180°

    • Eg. A1 + B1 + C2 = 180° (Int angles of a triangle)

  • The exterior angle of a triangle is equal to the sum of the two interior opposite angles

    • A1 + B1 = C1

<ul><li><p>The sum of the interior angles of a triangle is 180°</p><ul><li><p>Eg. A1 + B1 + C2 = 180° (Int angles of a triangle)</p></li></ul></li><li><p>The exterior angle of a triangle is equal to the sum of the two interior opposite angles</p><ul><li><p>A1 + B1 = C1</p></li></ul></li></ul><p></p>
10
New cards

Perimeter & Perimeter formulas

The perimeter of a shape is the total distance around its outer edges. It is found by adding the lengths of all the sides

Formulas:

  • Rectangles / Squares

    • Perimeter = Side + Side + Side + Side

    • Perimeter = Length + Width + Length + Width

  • Triangles

    • Perimeter = Side + Side + Side

  • Circles

    • Circumference = (Pi or 3.14) x Radius x 2

    • Circumference = (Pi or 3.14) x Diameter

<p>The perimeter of a shape is the total distance around its outer edges. It is found by adding the lengths of all the sides</p><p></p><p>Formulas:</p><ul><li><p>Rectangles / Squares</p><ul><li><p>Perimeter = Side + Side + Side + Side</p></li><li><p>Perimeter = Length + Width + Length + Width</p></li></ul></li><li><p>Triangles</p><ul><li><p>Perimeter = Side + Side + Side</p></li></ul></li><li><p>Circles</p><ul><li><p>Circumference = (Pi or 3.14) x Radius x 2</p></li><li><p>Circumference = (Pi or 3.14) x Diameter</p></li></ul></li></ul><p></p>
11
New cards

Area & Area formulas

  • The area of a shape is the amount of space it covers inside its boundaries

  • Measured in square units (cm², m², etc)

Formulas:

  • Rectangles / Squares

    • Area = Length x Width

  • Parallelograms

    • Area = Base x Height

  • Triangles

    • Area = Base x Height / 2

  • Circles

    • Area = (Pi or 3.14)Radius²

<ul><li><p>The area of a shape is the amount of space it covers inside its boundaries</p></li><li><p>Measured in square units (cm², m², etc)</p></li></ul><p></p><p>Formulas:</p><ul><li><p>Rectangles / Squares</p><ul><li><p>Area = Length x Width</p></li></ul></li><li><p>Parallelograms</p><ul><li><p>Area = Base x Height</p></li></ul></li><li><p>Triangles</p><ul><li><p>Area = Base x Height / 2</p></li></ul></li><li><p>Circles</p><ul><li><p>Area = (Pi or 3.14)Radius²</p></li></ul></li></ul><p></p>