5識幾題maths

1.The lengths of the sides of a triangle are in the radio 2:4:5.

(a) If the shortest side is 8 cm long,find the lengths of the other sides.
(b) If their total length is 66 cm,find the length of each side.

2. A distance of 2 km is represented by 1 cm on a map

(a) Find the scale of the map
(b) A pool has an area of 2 cm square on the map.Find its actual area.

3. A shirt:&126
A pair of jeans:$295
Discount for a pair of jeans:10%
Extra discount for total amount more than $350:10%
Estimate how much the bill is.