PSLE A square, not drawn to scale, is made up of four triangles R, S, T and U. The area of R is
110 the area of the square while the area of S is
320 the area of the square.
- The total areas of R and S is 1600 cm2. What is the length of each side of the square?
- What fraction of the square is Area of U?
(a)
Fraction of the square made up of Areas R and S
=
110 +
320=
220 +
320 =
520Areas R and S = 5 u
5 u = 1600
1 u = 1600 ÷ 5 = 320
Area of the square
= 20 u
= 20 x 320
= 6400 cm
2 Length of the square
= √6400
= 80 cm
(b)
Areas of R and U = Areas of S and T =
12 of the area of the square
Fraction of the square that is Area U
=
12 -
110=
510 -
110=
410
= 25
Answer(s): (a) 80 cm; (b) 25