Form2 maths

Question

Diagram 9 is a triangle.

Calculate the value of x. 

Diagram 12 shows a cylindrical container and a cuboid-shape aquarium. Hariza fill up the cylindrical container fully with water and pours into the aquarium three times. What is the percentage of water fills up the aquarium?

In Diagram 21, RSTU is the image of PQRS under an isometry transformation.

Calculate the value of x.

Answer 1

1）三角形内角角度总和：180°

方法一

40°+（180°-120°）=x

40°+60°=×

×=100°

方法二

180°-120°=60°

（三角形内角总和）180°-40°-60°

=80°

180°-80°=×

×=100°

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2）正方形内角总和：360°

<TSR=360°-90°-90°-110°

         =70°

70°×2=140°

×+140°=360°

x=360°-140°

  =220°

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wait huh

3）volume aquarium：20×30×20

=12000cm³

volume cylindrical container：

π（14÷2）²×20

=3.14×（14÷2）²×20

=3.14×7²×20

=3.14×49×20

=3077.2cm³

。

1000 cm³=1ml

3077.2cm³×3

=9231.6cm³

9231.6cm³=？ml

                  =9.23ml

12000cm³=？ml

                  =12ml

9.23

------       ×100%

12

=⁹²³/1200 ×100%

=76%/77%

谢谢