Pembahasan Soal UAS 2011. (lanjutan)

Soal kedua yang paling sedikit dijawab benar adalah soal nomor 6, dari kelas IX A sampai IX E sebanyak 160 orang yang menjawab dengan benar hanya 67 orang atau hanya 41,88 % saja.  Mari kita lihat soal nomor 6 tsb.

6.   The figure beside is a parallel position of a stick and a ladder.  The distance between bottom stick and wall is 14 cm while the distance between bottom stick and bottom ladder is 56 cm. If the length of stick is 50 cm, then the length of ladder is….

A.       200 cm       

B.        250 cm                   

C.        260 cm       

         D.    270 cm

Yang menjawab A ada 93 orang ( 58,13% )

Yang menjawab B ada 67 orang ( 41,88% )

Yang menjawab C tidak ada  ( 0 % )

Yang menjawab D tidak ada  ( 0 % ) 

Pembahasan:

AC = ladder
DE = stick
AD = 56 cm
DB = 14 cm
DE = 50 cm
DE : AC = DB : AB
50 : AC = 14 : ( 56 + 14 )
50 : AC = 14 : 70
AC x 14 = 50 x 70
AC = 3500 : 14
AC = 250 cm
Jadi jawabannya adalah B

Pembahasan Soal UAS 2011.

Dari hasil analisis hasil Ulangan Akhir Semester 1 diperoleh kesimpulan :
Soal yang paling sedikit dijawab benar adalah soal nomor 1, dari kelas IX A sampai IX E sebanyak 160 orang yang menjawab dengan benar hanya 20 orang atau hanya 12,5 % saja.  Mari kita lihat soal nomor 1 tsb.

1.             Consider the pairs of plane below:

                      i.            Two isosceles triangles

                    ii.            Two isosceles right triangles

                  iii.            Two regular hexagon

                  iv.            Two rectangles

The pair(s) which always similar is (are)….

A.      i, ii and iii                                                               

B.       ii and iii                  

C.       ii, iii and iv

D.      iii only

Yang menjawab A ada 16 orang ( 10% )

Yang menjawab B ada 20 orang ( 12,5% )

Yang menjawab C ada 42 orang ( 26,25% )

Yang menjawab D ada 82 orang ( 51,25% ) 

Pembahasan:

Pasangan bangun-bangun yang sebangun :

i    dua segitiga sama kaki belum tentu sebangun tergantung sudutnya sama atau tidak

ii   dua segitiga siku-siku sama kaki pasti sebangun karena sudut yg bersesuaian sama yaitu 90, 45 , 45

iii  dua segienam beraturan pasti sebangun karena karena sudut yg bersesuaian sama yaitu 120, dan sisinya sebanding

iv  dua persegi panjang belum tentu sebangun tergantung perbandingan sisinya sama atau tidak meskipun sudutnya sama yaitu 90

jadi jawaban yang benar adalah B ( ii dan iii  )

bersambung.....

 

Hasil UAS Matematika

Ulangan Akhir Semester Gasal berlangsung dari tanggal 5 Desember 2011 sampai 10 Desember 2011.
Untuk mata pelajaran Matematika dilaksanakan hari Rabu tanggal 7 Desember 2011 jam 07.30 - 09.30.
Dari kelas IX A sampai IX E banyaknya siswa ada 160 orang, dengan banyaknya soal 40 , pilihan ganda, diperoleh hasil sebagai berikut:
Nilai tertinggi : 97,50
Nilai terendah : 40,00
Nilai rata-rata : 80,00
Standart Deviasi : 10,18
Dengan KKM 78 maka yang nilainya sudah mencapai dan melampaui KKM saya ucapkan selamat, dan bagi yang belum mencapai KKM saya harapkan lebih giat belajar, Insya Allah kalian BISA.
Daftar nilai selengkapnya bisa didownload pada link di bawah ini.
Kelas IX A
Kelas IX B
Kelas IX C
Kelas IX D
Kelas IX E

ACHIEVEMENT EXAMINATION OF THE FIRST SEMESTER ACADEMIC YEAR 2010 / 2011

1.     The diagram shows a scale drawing of the plan of department store with a scale  1 : 400. The shape of each store is a rectangle. The area, in m², of the shoe store is….

A.      24                                                   

B.        48   

C.       72                                       

D.      96

2.             In the diagram, PQR and TUV are similar triangles. The length, in cm, of TU is ….

A.         2                                                

B.           6                           

C.          6                        

D.         7





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Table of Specification of Final Semester Test Items

1.      Given some figures, students determine which two figures are similar.

2.      Given that trapezoid ABFE and EFCD are similar, students determine the length of EF.

3.      Given the sides of a triangle, students choose another triangle that is similar.

4.      Students determine that two triangles are congruent.

5.      Given the lengths of two congruent triangles, students determine   the measures of the corresponding angles.

6.      Given a diagram, students determine the length of a ladder

7.      Given a diagram consisting of a combination of two right triangles, students determine the height of the top

8.      Given a diagram, students determine the height of a man using the concept of similarity.

9.      Students calculate the height of a tree using the concept of similarity.

10.  Given some regular polygons, students determine the regular polygons that can form a regular tessellation

11.  Given some figures of a tessellation, students determine the figure   tessellation with three shapes

12.  Given the shapes of solids with curved surfaces, students determine their elements.

13.  Given the radius and the lateral surface area of a cone, students calculate its height.

14.  Given the radius and the height of a cylinder, students calculate its surface area.

15.  Given the volume of a sphere, students calculate its radius.

16.  Given the surface area of a cylinder, and the ratio of the radius to the height, students calculate the height.

17.  Given the diameter, and the slant height of a cone, students calculate its surface area.

18.  Given the radius of a sphere, students calculate its surface area.

19.  Given the ratio of the radii of two spheres, students determine the ratio of their areas.

20.  Given the radius and the height of a conical hat, students calculate the area of the material for making 10 hats.

21.  Given the object constructed of a hemisphere and a cone, students calculate its volume.

22.  Given the volume and the height of a conical object, students determine its radius.

23.  Given two wheels with different radii and heights, students calculate the difference of the surface areas.

24.  Given math scores from 10 to 15, students determine the mean of the data.

25.  Given some data, students determine the value of the data, if the mean is known.

26.  Given the mean score of several students, some other students joining them and the new mean score, students determine the mean score of the newly joining students.

27.  Given random data, students determine the median of the data.

28.  Given random data, students determine the mode of the data

29.  Given a frequency distribution table and the mean, students determine the value of the data.

30.  Given a bar diagram, students determine the mean of the data.

31.  Given a line diagram, students are able to interpret the data.

32.  Given a pie diagram, students determine the value of the data.

33.  Given a bar diagram, students estimate the median.

34.  Given 1 dice and 1 coin, students determine the sample space.

35.  Given an event of rolling a coin and two dice, students determine the total of sample points.

36.  Given an event of rolling two dice, students determine the probability of getting the dice.

37.  Given an event of tossing three coins, students determine the probability of the appearance of the head and the tail

38.  Given a word randomly, students determine the probability of a letter to appear.

39.  Given the probability of an event, students determine the complementary probability of an event.