1. Diketahui segitiga ABC dengan panjang AB = 6 cm, <A=30’, dan <C = 120’. Luas segitiga ABC adalah

2. Tentukn nilai dari tan 225˚ + sin 120˚ - cos 330˚

3.  ½ tan 240˚ + 390˚ + 2 sin 240˚

4. Buktikan bahwa:

5. 1 per sec α – tan α   -  1 per sec α + tan α  =  2tan α

1. gunakan rumus L =  1/2 b.c sin A , sisi b belum diketahui, dicari dengan aturan sinus  setelah dicari b = 2 akar 3 ( coba cek ), sehingga L = 1/2 6 . 2 akar 3 sin 30⁰ = 3 akar 3  satuan luas

2.  tan225˚+ sin120˚- cos330˚= tan (270⁰ - 45⁰) + sin (180⁰ - 60⁰) - cos (360⁰ - 30⁰) =

                                              = tan 45^o  + sin 60⁰ - cos 30⁰

                                              = 1 + 1/2 akar3 - 1/2 akar 3 =  1

3.  ½ tan 240˚ + 390˚ + 2 sin 240˚ ( saya kurang jelas dengan soal ini  390⁰ itu sin, tan apa cos ) diperjelas lagi ya mas ?

4 - 

5 . silahkan download 

NASA has analyzed 118 cases related to the use of personal electronic devices in aircraft. The NASA ..... in June 2001 concluded that 25 of these cases were strongly correlated with the use of cell phones, and 16 of these were critical cases.

Mohon bantuannya untuk mengisi titik titik tersebut di atas.

Atas perhatian dan jawabannya saya ucapkan terima kasih.. ^_^

Tolong kami dibantu penyelesaian soal berikut ini :

1. Sebuah batu berbentuk belahan bola dgn panjang jari-jari 10 cm, tentukan luas seluruh permukaan batu tsb.

2.  Jumlah tiga bilangan genap berurutan adalah 90. Tentukan ketiga bilangan tersebut !

3. Jumlah 5 bilangan ganjil berurutan adalah 55. tentukan bilangan-bilangan tersebut 

4. Jika jumlah 9 bilangan ganjil berurutan adalah 171, tentukan bilangan  terkecil dan bilangan terbesar !

5. Tiga bilangan asli membentuk suatu barisan aritmatika.  Jumlah ketiga bilangan itu adalah 12. Jika bilangan ketiga di tambah 2, maka bilangan-bilangan itu membemtuk barisan geometri. Carilah bilangan-bilangan itu.

Matur suwun pak,

Anggito

1. Luas permukaan bola padat  = 3∏r²

                                             = 3 x 3,14 x 10 x 10

                                             = 2826 cm²

^{2. Misal bil pertama n, maka bil kedua (n + 2), dan bbil ketiga (2 + 4), sehingga :}

             ^{n  +  (n + 2) + (n + 4) = 90}

                                     ^{3n + 6 = 90}

                                      ^{3n = 90 - 6}

                                      ^{3n = 84}

                                       ^{n = 28}

^{Jadi ketiga bilangan tersebut 28, 30, dan 32}

^{3. n + (n+2) + (n + 4)+  (n + 6) + (n + 8) = 55}

                                                       ^{5n + 20 = 55}

                                                               ^{5n = 35}

                                                                 ^{n = 7}

^{Jadi kelima bilangan tersebut ; 7, 9, 11, 13, dan15}

^4. n + (n+2) + (n + 4)+  (n + 6) + (n + 8) + (n + 10) + (n + 12) + (n + 14) + (n+ 16)  = 171

                                      9n + 72 = 171

                                              9n = 99

                                                n = 11

Jadi bilangan terkecil 11 dan bilangan terbesar = 11 + 16 = 27

5 . Bilangan tersbut 2, 4, dan 6

Once upon a time, there was a Mouse, who always lived on the land. By an unlucky chance, he formed an intimate acquaintance with a Frog, who lived in the water.

            One day, the Frog was intent on mischief. He tied the foot of the Mouse tightly to his own. Then, the Frog led his friend, the Mouse, to the meadow where they usually searched for the food. After this, he gradually led him towards the pond in which he lived, until reaching the banks of the water. He suddenly jumped in, dragging the Mouse with him.

            The frog enjoyed the water amazingly and swam croaking about, as if he had done a good deed. The unhappy Mouse was soon sputtered and drowned in the water. Soon afterwards, his poor dead floated on the surface.

            A Hawk observed the floating Mouse from the sky. He dove down and grabbed it with his talons, carrying it back to his nest. The Frog, being still fastened to the leg of the Mouse, was also carried off a prisoner, and was eaten by the Hawk.

Pertanyaannya adalah:

The Frog tied the Mouse’s foot tightly to his leg because ……………

a.   he planned to travel around the pond with the Mouse

b.   he wanted to show his misbehavior and got pleasure from it

c.   he intended to tell the Mouse about the place where he found the     food

d.   he meant to protect the Mouse if the Hawk suddenly attacked him