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
15 the area of the square.
- The total areas of R and S is 30 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 +
15=
110 +
210 =
310Areas R and S = 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Area of the square
= 10 u
= 10 x 10
= 100 cm
2 Length of the square
= √100
= 10 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) 10 cm; (b) 25