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標題:
f.1 maths
發問:
1.The lengths of the sides of a triangle are in ratio 2:4:5.a.Ifthe shortest side is 8cm long , find the length of the other sides.b.If their total length is 66 , find the length of each side.2.A distance of 2km is represented by 1cm on a map.a.Find the scale of the map. b.A pool has an area of 2 cm... 顯示更多 1.The lengths of the sides of a triangle are in ratio 2:4:5. a.Ifthe shortest side is 8cm long , find the length of the other sides. b.If their total length is 66 , find the length of each side. 2.A distance of 2km is represented by 1cm 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.If x> √11 and x is a positive integer , then x can be ? a.2 b.3 c.3.32 d.4 4.Which of the following is not a Fibonacci number? (a).3 (b).4 (c).21 (d).89 5.(a)Construct △ABC such that AB＝5cm , BC＝6cm ,CA＝5cm (b)Construct the perpendicular bisector of BC such that it meet BC at D. (c)Does the perpendicular bisector constructer in (Q.b) pass through a ?
最佳解答:
1.The lengths of the sides of a triangle are in ratio 2:4:5. a.Ifthe shortest side is 8cm long , find the length of the other sides. Let x and y be the other two sides, x:8=4:2 2x=32 x=16 y:8=5:2 2y=40 y=20 Hence, the other two sides are 16, 20,, b.If their total length is 66 , find the length of each side. Let a,b and c be the three sides a:b:c=2:4:5(Given) a:b=2:4 4a=2b b=2a a:c=2:5 5a=2c c=2.5a a+b+c=66 a+2a+2.5a=66 5.5a=66 a=12 b=2a b=24 c=2.5a c=30 The length of the other sides are 12,24 and 30,, 2.A distance of 2km is represented by 1cm on a map. a.Find the scale of the map. The scale on a map =1:2x100x1,000 =1:200,000,, b.A pool has an area of 2 cm square on the map. Find its actual area. Its actual area =2x200,000x200,000 =2x2kmx2km =8km square 3.If x> √11 and x is a positive integer , then x can be ? a.2 b.3 c.3.32 d.4 Since, 2
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