Rhifedd ar Draws y Cwricwlwm Ysgol Dyffryn Conwy Numeracy Across the Curriculum  

           

 

               

   

 

   

                 

     

   

                   

SIAPIAU SHAPES

Faint o le sydd y tu mewn i siap 2D How much space is inside a 2D shape

O amgylch tu allan i siâp Around the outside of a shape

Faint o le sydd y tu mewn i siap 3D How much space is inside a 3D shape

Perimedr Petryal = 2 x (hyd + lled) Perimeter of a Rectangle = 2 x (length + width) = 2 x (7 + 3) = 20cm Arwynebedd Petryal = hyd x lled Area of a Rectangle = length x width = 7 x 3 = 21cm2

7cm

3cm

 

6cm

3cm

Arwynebedd Triongl = sail x uchder 2 Area of a Triangle = base x height 2

Cyfaint Ciwboid = hyd x lled x uchder Volume of a Cuboid = length x width x height = 8 x 2 x 5 = 80 cm3

= 6 x 3 = 18 = 9cm2

2 2  

8cm

5cm

2cm

Cylchedd Cylch = 2 π r Circumference of a Circle = 2 x 3.14 x 5 = 31.4cm Arwynebedd Cylch = π r2 Area of a Circle = 3.14 x 52 = 78.5cm2