PSLE A square, not drawn to scale, is made up of four triangles J, K, L and M. The area of J is
110 the area of the square while the area of K is
15 the area of the square.
- The total areas of J and K is 1920 cm2. What is the length of each side of the square?
- What fraction of the square is Area of M?
(a)
Fraction of the square made up of Areas J and K
=
110 +
15=
110 +
210 =
310Areas J and K = 3 u
3 u = 1920
1 u = 1920 ÷ 3 = 640
Area of the square
= 10 u
= 10 x 640
= 6400 cm
2 Length of the square
= √6400
= 80 cm
(b)
Areas of J and M = Areas of K and L =
12 of the area of the square
Fraction of the square that is Area M
=
12 -
110=
510 -
110=
410
= 25
Answer(s): (a) 80 cm; (b) 25