Five identical square tiles were pasted onto a rectangular wall shown .
- What is the area of the rectangular wall?
- What is the perimeter of the shaded part?
(a)
Length of each square tile
= 45 - 30
= 15
Length of the rectangle
= 20 + (4 x 15)
= 20 + 60
= 80
Area of the rectangular wall
= 80 x 45
= 3600 cm
2 (b)
Perimeter of the shaded part
= 45 + 45 + (80 - 15) + (80 - 15)
= 45 + 45 + 65 + 65
= 220 cm
Answer(s): (a) 3600 cm
2; (b) 220 cm