Figure CDEF is made up of eight identical rectangles. Each rectangle has a length of 15 cm.
- Find the perimeter of Figure CDEF.
- Find the area of Figure CDEF
(a)
Breadth of one rectangle = 1 u
Length of one length = 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
Length of Figure CDEF = 6 u
Breadth of Figure CDEF = 4 u
Perimeter of Figure CDEF
= 6 u + 6 u + 4 u + 4 u
= 20 u
= 20 x 5
= 100 cm
(b)
Area of 1 rectangle
= 15 x 5
= 75 cm
2 Area of Figure CDEF
= 8 x 75
= 600 cm
2 Answer(s): (a) 100 cm; (b) 600 cm
2