PSLEThe figure is made up of two rectangles, NPVT and TURS, and two right-angled isosceles triangles, PQV and RQU. PN = 7 cm, RS = 4 cm and PV =
w cm. NTS and QVUT are straight lines.
- Find the length of NS in terms of w. Give your answer in the simplest form.
- Find the total area of the figure when w = 10.
(a)
Length VU
= 7 - 4
= 3 cm
Length QV =
w cm (Isosceles triangle)
Length UR
= Length CG
= (
w + 3) cm (Isosceles triangle)
Length NS
=
w +
w + 3
= (2
w + 3) cm
(b)
Area of Rectangle NPTV
= 10 x 7
= 70 cm
2 Length TS
=
w + 3
= 10 + 3
= 13 cm
Area of Rectangle RSTU
= 13 x 4
= 52 cm
2 Area of Triangle PQV
=
12 x 10 x 10
= 50 cm
2 Area of Triangle QRU
=
12 x 13 x 13
= 84.5 cm
2 Total area of the figure
= 70 + 52 + 50 + 84.5
= 256.5 cm
2 Answer(s): (a) (2
w + 3) cm; b) 256.5 cm
2