Cara Mengingat Sinus sudut 30, 60, dan 90
Dalam fisika ketika mempelajari materi yang berhubungan dengan vektor, momen gaya, getaran, maupun gelombang peserta didik sering dihadapkan pada sudut-sudut istimewa seperti sin 30, sin 60, cos 30, sin 90, cos 90 dan sebagainya.
Pada saat proses pembelajaran berlangsung saya merasa anak didik telah menguasai sudut-sudut istimewa tersebut, karena setiap saya memberikan contoh soal kemudian menanyakan sin 3o, secara serentak siswa menjawab “setengah…”.
Namun berbeda ketika saya menganalisis hasil ulangan, ternyata sebagian besar salahnya justru pada nilai sin, cos, maupun tangen sudut tersebut. Permasalahannya sepele sebenarnya yaitu terbalik. Saat dikonvirmasi ke peserta didik sebagian menjawab “Bingung pak kalau sudah banyak soal, antara sin 30 dan sin 60 mana yang setengah …”
Ternyata apa yang saya perkirakan ketika proses pembelajaran berlangsung tidak sesuai dengan hasil evaluasinya. Dari kejadian inilah akhirnya saya bercerita kepada peserta didik tentang pengalaman saya waktu sekolah dulu bagaimana cara mengingat nilai sin 30 dan 60 agar tidak terbalik.
Dulu saya pernah punya teman namanya “Chosanah”, anaknya banyak mulut dan sering tidak terkontrol bila ngomong. Dari sikapnya itu teman-teman yang lain kadang-kadang sambil bergurau mengatakan “Sinting kamu Nah” atau “Sinting-Nah”.
Terinspirasi pelajaran matematika tentang sin dan cos , akhirnya saya sering memanggilnya dengan sebutan Cosanah-Sintingah. Apa Artinya ?…
- Cosanah = Cos enampuluh setengah
- Sintingah = sin tigapuluh setengah
Nah kalau kedua atau salah satu saja ingat maka yang lain tentu ingat. misal yang kita ingat Sintingah = Sin tigapuluh setengah, maka sin 60 pasti setengah akar tiga. kalau sin 60 setengah akar tiga, ya pasti cos 60 = setengah, karena nilainya kan setengah dan setengah akar tiga.
Kalau Sin sembilan puluh ? bagaimana,….suatu saat protes.
lalu saya jawab sekenanya, ..lho kamu kalau sore suka nonton cerita sangaji di TVRI kan ?
Apa hubungannya ? gak nyambung sama pertanyaan tuuuu…., sahutnya.
Ya adaa..lah….. Sangaji itu kan Sin sangangpuluh siji (sin sembilan puluh = 1).
Sambil tertawa Chosanah malah mengatakan saya gila,…..”gila kamu!”
Wah ternyata orang sinting kalau temu sama orang gila malah dapat membuat cara ngapalin rumus nih.
Nah….Sejak saat itu peserta didik yang ketemu saya tidak lagi mengenal nama saya, malah saya disebutnya sangaji
Yaa,….tidak apa-papa Sangaji kan Sin sangangpuluh siji.
Bagaimana…?, Anda suka dengan sangaji ? kasih komentar dong !
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Dear Kang Guru…..
Saya hanya ingin Brainstormung aja mengenai hapalan sudut sudut istimewa dalam trigonometri.Saya mencoba untuk mengingat secara sederhana saja tentang suut 30 derajat.Segitiga siku siku yang salah satu sudutnya 30 derajat,maka sisi depannnya bernilai 1, sisi miringnya bernilai 2.Otomatis sisi Cos nya adalah akar 3(berdasar hukum Phytagoras).Sehinggga otomatis kita dapat menghapal dua sudut istimewa yaitu 30 dan 60 derajat, sekaligus paham dari sinus sd cotangen….dst.dari 0 derajat sd 360 derajat.
Wasalam
Mulyata.
ijin share ke FB
wah…jd inget waktu dibangku SMA nich pak guru…he
backlink ya….
ane tunggu…pak guru.
terima kasih guru.. atas ilmunya yang memudahkan saya memahami dan mengerti prinsip dasar fisika “awuran.” hehehehe.. yang penting bukan rumus tapi pemahaman..
mantap ceritax..jdi bagus tuh diterapkan kesiswa biar ga ngantuk
jadi inget waktu sekolah pak, untungnya di sekolah boleh pakai calculator scientific
hehe…iya yah jadi inget waktu sma dulu
Alhamdulillah, masih ingat massa lalu. terima kasih kunjungannya
Jadi ingat pada masa remaja dulu, Sangaji yang merupakan salah satu tokoh cerita drama berkarakter cerdas dan rendah hati ternyata bisa juga untuk menghafal rumus fisika.
Mr. Teguh mmg super kreatif!