# Sine + real numbers - math problems

#### Number of problems found: 7

• Cotangent If the angle α is acute, and cotg α = 1/3. Determine the value of sin α, cos α, tg α.
• Trigonometric functions In the right triangle is: ? Find the value of s and c: ? ?
• Regular 5-gon Calculate the area of the regular pentagon with side 7 cm.
• IS triangle Calculate interior angles of the isosceles triangle with base 40 cm and legs 22 cm long.
• Angles Determine the interior angles of a rhombus with area 319.1 cm2 and perimeter 72 cm.
• Cuboid Determine the dimensions of cuboid a, b, c; if diagonal d=9 dm has angle with edge a α=55° and has angle with edge b β=58°
• Observer The observer sees a straight fence 100 m long in 30° view angle. From one end of the fence is 102 m. How far is it from another end of the fence?

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Most natural application of trigonometry and trigonometric functions is a calculation of the triangles. Common and less common calculations of different types of triangles offers our triangle calculator. Word trigonometry comes from Greek and literally means triangle calculation.