PSLE A square, not drawn to scale, is made up of four triangles B, C, D and E. The area of B is
110 the area of the square while the area of C is
320 the area of the square.
- The total areas of B and C is 1600 cm2. What is the length of each side of the square?
- What fraction of the square is Area of E?
(a)
Fraction of the square made up of Areas B and C
=
110 +
320=
220 +
320 =
520Areas B and C = 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 B and E = Areas of C and D =
12 of the area of the square
Fraction of the square that is Area E
=
12 -
110=
510 -
110=
410
= 25
Answer(s): (a) 80 cm; (b) 25