Calculate the area and perimeter of 2D shapes including triangles and circles
Parts of circles worksheet - you must be familiar and comfortable with radius and diameter. There are printed copies of this worksheet in the classroom.
and check your answersย
๐ฅ Watch video A and complete the guided notes
means the total length around a shape
square = 4 x length
triangle = length a + length b + length cย
equilateral triangle = 3 x length (because all sides are equal)
rectangle and parallelogram = 2(length + width) OR 2 x length + 2 x width
The main thing is that you add up the length of every side of the shape.
2. ๐ฅ Watch video B and complete the guided notes
Perimeter is the distance around any 2D shape.ย
Circumference is a special name for the perimeter of a circle, or 2D shapes with curves.ย
We use ฯ when we need to calculate the area or circumference of a circle. Make sure you learn this formula because it won't be given to you in the exam.
3. ๐ MUST DO activity in Google classroom
Complete your 2D shape reference sheet with the formula for the circumference of a circle.
4.๐ mastery check