Stačiojo trikampio smailiojo kampo sinusas, kosinusas, tangentas APPLICATION OF THE SINE, COSINE AND TANGENT OF THE RIGHT TRIANGLE’ S ACUTE ANGLE Stačiojo trikampio smailiojo kampo sinusas, kosinusas, tangentas

Mokymo(si) uždavinys Šioje pamokoje išmoksite: Remdamiesi teorija, naudodamiesi kompiuterine programa „MATHEMATICA+M@th Desktop“ ir dirbdami porose išspręsti 3 iš 6 I ir II dalies uždavinius apie stačiojo trikampio smailiojo kampo sinusą, kosinusą, tangentą ir nusakyti bent tris iš penkių sąvokų anglų kalba.

Key Words ANGLE The space between two lines or surfaces at the point at which they touch each other, measured in degrees. RIGHT ANGLE The angle wchich equals to 90˚. RIGHT-ANGLED TRIANGLE A triangle with the right angle.

HYPOTENUSE The side opposite the right angle in a right- angled triangle. RATIO The relationship between two groups or amounts, which expresses how much bigger one is than the other.

Sine, Cosine and Tangent Ratios http://www.youtube.com/watch?v=Y6UW9rF Ua5E

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Exercise 1

Solution

Remember the words To find – nustatyti Length – ilgis Missing – trūkstamas Side – kraštinė Angle – kampas Solution - sprendimas

Solution: d= 1022.01m

Remember the words To reach – pasiekti Boarder –riba Distance – atstumas To save – sutaupyti Directly – tiesiai To calculate – skaičiuoti, apskaičiuoti Way - būdas

Exercise 3

Solution

Remember the words To determine – nustatyti Solution - sprendimas

Exercise 4

Solution: b= 5078.36m

Remember the words Breadth – plotis Downstream – pasroviui Side of the river – upės pusė How broad... – kokio pločio... At least - mažiausiai