PSLE A square, not drawn to scale, is made up of four triangles R, S, T and U. The area of R is
19 the area of the square while the area of S is
16 the area of the square.
- The total areas of R and S is 4000 cm2. What is the length of each side of the square?
- What fraction of the square that is Area U?
(a)
Fraction of the square made up of Areas R and S
=
19 +
16=
218 +
318 =
5185 u = 4000
1 u = 4000 ÷ 5 = 800
Area of the square
= 18 u
= 18 x 800
= 14400 cm
2 Length of the square
= √14400
= 120 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 -
19=
918 -
218
= 718
Answer(s): (a) 120 cm; (b) 718